Preparation method and application of a rare earth anti-blue light screen protector

Abstract

The present invention relates to the technical field of display film products with white LED as the backlight source, and discloses a preparation method and application of a blue light blocking film. The steps of the film preparation method are as follows: (1) adding a polymer binder material and an organic rare earth light conversion material into an organic auxiliary agent (solvent) and mixing to obtain a coating; (2) coating the coating on the front side of a resin film to form a blue light blocking functional coating and subjecting the coating to a light / heat curing method to obtain a base film; (3) or melting and blending the organic rare earth light conversion material into a base resin to obtain a base film; (4) coating a pressure-sensitive adhesive (PSA) on the back side of the base film, and then laminating release films on both sides of the base film respectively. The protective film obtained by the present invention has good absorption and conversion properties for blue light, and at the same time has a high visible light transmittance. Moreover, the final product has a low yellow index and does not affect the display effect of the electronic screen itself. Compared with the existing technology, the blue light blocking protective film provided by the present invention will not bring color deviation and resulting visual fatigue to users.

Description

Technical Field

[0001] The present invention relates to a preparation method and application of a blue light blocking protective film, belonging to the field of functional films. Background Art

[0002] Display components with white light LEDs as the display backlight system have become the main product solutions of existing electronic display technologies. Such display screens are widely used in mobile communication terminal devices, computer devices, household and commercial display devices, entertainment devices, etc. The blue light hazards and "blue-rich" photobiological safety problems brought by white light LEDs are major technical defects of such display screens. The light radiation hazards of white light LEDs are mainly manifested in aspects such as near-ultraviolet radiation damage to the eyes and photochemical damage of retinal blue light. Short-wavelength high-energy blue light with a peak around 430 nm can cause retinal photochemical damage and apoptosis of pigment epithelial cells. Short-wave blue light has high energy and tissue penetration ability, and has a strong destructive effect on the biological photosensitive groups of mammals, causing retinal lesions. Pathological studies show that the high-energy blue light in white light LEDs may play a certain accelerating role in the formation mechanism of age-related macular degeneration. Since the retinal macula of children has a weak ability to absorb blue light, under the same light intensity, the amount of blue light radiation transmitted is about twice that of adults, and the harm of blue light radiation to children's retinas is even greater. If young people in the growth and development stage are in a high-energy blue light illumination environment for a long time, it will induce blinding eye diseases in the lightest case and cause lifelong low vision in the most serious case.

[0003] At present, the mainstream blue light absorbing materials are mostly organic small molecule blue light absorbing materials. The two major types of electronic display screen protection products with blue light blocking functions made are blue light protection glasses and blue light blocking functional film stickers. Due to the poor stability of organic small molecule blue light absorbing materials themselves, their heat and moisture resistance is not good, especially their own base color is relatively deep, resulting in a high yellow index of the products made, and ultimately affecting the true presentation of the display effect.

[0004] The saturated coordination organic rare earth complex optical functional materials developed based on China's strategic resource rare earth materials have significant photophysical properties and excellent weather resistance. Compared with traditional rare earth oxide luminescent materials, they have improved resin compatibility and processing convenience. Especially, the application of tetrazole europium complexes excited by blue light in the field of blue light protection not only realizes the effective absorption and conversion of high-energy blue light, but also reduces the yellowing coefficient of blue light protection film products, and the blue light protection does not show color deviation.

[0005] Therefore, the present invention provides a method for preparing an anti-blue light screen protection film, which can absorb short-wave high-energy blue light and convert it into red light visible light in a longer wavelength band, achieving the barrier protection against blue light and effectively reducing the harm of blue light to the human eye. It can be applied not only to the display screens of electronic products such as mobile phones, computers, TVs, and instruments, but also to fields such as packaging, compounding, electrical, and medicine. In addition, an anti-blue light screen protection film in the present invention also has the advantages of water resistance, oil resistance, corrosion resistance, scratch resistance, explosion protection, etc. Summary of the Invention

[0006] The object of the present invention is to achieve blue light protection by using an organic rare earth light conversion material with extremely narrow optical output bandwidth characteristics and excellent weather resistance. In particular, a rare earth complex with europium (III) as the central ion and tetrazole as the organic ligand, whose fluorescence emission peaks are at 500 nm and 610 nm respectively, with 610 nm being the maximum emission peak, and a material that emits red light under the excitation of 410 nm excitation light. To provide an anti-blue light screen protection film and its preparation method, specifically related to a laminated film product made of organic rare earth light conversion materials, surface coatings, and resin films.

[0007] The technical solution adopted by the present invention is:

[0008] In the first aspect of the present invention, an anti-blue light screen protection film is provided, which includes a resin film, an anti-blue light functional coating disposed on the resin film layer (front side), a release film layer disposed on the anti-blue light functional coating, a pressure-sensitive adhesive layer disposed under the resin film layer (back side), and a release film layer disposed under the pressure-sensitive adhesive layer.

[0009] Preferably, the components of the above anti-blue light functional coating include a polymer binder, an organic auxiliary agent (solvent), a curing initiator, and an organic rare earth light conversion material.

[0010] Preferably, the components of the above anti-blue light functional coating include 15 - 40 parts by mass of a polymer binder, 70 - 150 parts by mass of an organic auxiliary agent (solvent), 0.5 - 4 parts of a photoinitiator, and 0.5 - 10 parts of an organic rare earth light conversion material. The main purpose of coating the anti-blue light functional coating on the resin film is to endow the film with the functions of light conversion and scratch resistance.

[0011] Preferably, the above organic rare earth light conversion material is a polycyclic aromatic hydrocarbon rare earth complex. βAt least one of rare earth β-diketone complexes, heterocyclic rare earth complexes and heteronuclear lanthanide complexes; further preferably, the above-mentioned organic rare earth light conversion material is a heterocyclic rare earth complex with tetrazole as the organic ligand and the central coordination ion is europium, and its fluorescence emission peaks are at 500 nm and 610 nm respectively, where 610 nm is the maximum emission peak, and red light is emitted under the excitation of 410 nm excitation light. Selecting the organic rare earth light conversion material can endow the blue light blocking functional coating with the blue light blocking effect.

[0012] Preferably, the particle size range of the above-mentioned organic rare earth light conversion material particles is selected from 0.1 μm - 10 μm; preferably, the particle size range of the organic rare earth light conversion material is selected from 0.8 μm - 6 μm.

[0013] Preferably, the above-mentioned polymer binder is at least one selected from polyester acrylate, polyether acrylate, and polyurethane acrylate.

[0014] Preferably, the above-mentioned organic auxiliary agent (solvent) is at least one selected from toluene, xylene, tetrahydrofuran, ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, monofunctional acrylate or methacrylate, difunctional acrylate or methacrylate, 4 - 6 functional acrylate or methacrylate.

[0015] Preferably, the above-mentioned curing initiator is at least one selected from ethyl benzoyl lactate initiators, benzoyl peroxide initiators, α α-hydroxy ketone initiators.

[0016] The present invention has no special restrictions on the type and thickness of the resin film, and a transparent optical grade polymer resin film well-known to those skilled in the art can be used. In the examples of the present invention, the substrate resin film can be selected from polyacrylic resin film, polycarbonate film, cellulose acid film or thermoplastic polyester film; preferably, the resin film can be at least one selected from optically grade triacetyl cellulose (TAC) film, polyethylene terephthalate (PET) film, polycarbonate (PC) film or acrylic (PMMA) film.

[0017] Preferably, the above-mentioned pressure-sensitive adhesive is an organosilicon pressure-sensitive adhesive. The organosilicon pressure-sensitive adhesive has better weather resistance and at the same time has a self-exhaust function, and can achieve a good self-bonding effect.

[0018] Preferably, the components of the above-mentioned pressure-sensitive adhesive (PSA) include resin, organic solvent, cross-linking agent and catalyst; the main purpose of coating the back of the resin film with a pressure-sensitive adhesive (PSA) layer is to be able to attach the blue light blocking film to the surface of the display screen, which is easy to construct and use; the source of the pressure-sensitive adhesive of the present invention is not particularly limited, and an organosilicon pressure-sensitive adhesive of a general type well-known to those skilled in the art can be used, which can be purchased from the market.

[0019] Preferably, the above-mentioned release film is at least one selected from the group consisting of a BOPP layer, a PP layer and a PE layer, which has good antistatic and scratch resistance; preferably a PET layer, which not only has good scratch resistance but also has an antistatic effect.

[0020] Preferably, the thickness of the above-mentioned blue light blocking base film is selected from 50 μm to 500 μm; more preferably, the thickness of the blue light blocking base film is selected from 100 μm to 280 μm; still more preferably, the thickness of the blue light blocking base film is selected from 200 μm to 250 μm.

[0021] Preferably, the thickness of the above-mentioned blue light blocking functional coating is 150 μm to 250 μm, the thickness of the pressure-sensitive adhesive layer is not limited, and the thickness of the release film is 50 μm to 100 μm.

[0022] In the second aspect of the present invention, a method for preparing a blue light blocking screen protector is provided, including the following steps:

[0023] (1) Coating a blue light blocking functional coating on the front of the resin film, drying, and curing by ultraviolet light;

[0024] (2) Adding a release film layer on the blue light blocking functional coating;

[0025] (3) Coating a pressure-sensitive adhesive layer on the back of the resin film and curing;

[0026] (4) Adding a release film layer under the pressure-sensitive adhesive layer to obtain the blue light blocking screen protector having the above composition.

[0027] Preferably, the coating method in the above step (1) is blade coating or rod coating (microgravure coating).

[0028] Preferably, in the above step (1), the drying is carried out by heating to 80 °C to 130 °C, and the drying time can be 0.1 hour to 1.0 hour.

[0029] Preferably, the light source for ultraviolet curing in the above step (1) is a high-pressure mercury lamp or a microwave electrodeless lamp, and the ultraviolet light energy intensity during ultraviolet light irradiation is 500 - 800 mj / cm 2 。

[0030] Preferably, the coating method in the above step (3) is slot coating.

[0031] Preferably, the curing temperature in the above step (3) is 100°C to 150°C, and the curing time is 10 minutes.

[0032] The technical solution of the present invention has at least the following beneficial effects:

[0033] (1) In the anti-blue light functional coating of the present invention, an organic rare earth light conversion material is selected as the absorption and conversion material for high-energy blue light, which can absorb short-wave high-energy blue light and convert it into red visible light with a longer wavelength, realizing the blocking and protection of blue light, and effectively reducing the harm of high-energy blue light in electronic displays to the human eye;

[0034] (2) The organic rare earth light conversion material selected in the present invention has a reasonable particle size range and good compatibility with the polymer binder material in the anti-blue light functional coating, and is easy to produce and process. Therefore, on the premise of ensuring the transparency of the anti-blue light screen protector, a lighter film layer background color is achieved;

[0035] (3) Different from traditional inorganic materials with a high yellow index and small molecule organic blue light absorption materials, directly adding them to the anti-blue light functional coating will reduce the transparency of the anti-blue light functional coating, and when applied to the display screen, the color deviation seriously affects the use experience. The present invention does not need to add oil-soluble transparent purple dye and / or oil-soluble transparent blue dye to adjust the color of the screen protector. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0037] Figure 1 It is a schematic structural diagram of the anti-blue light protective film provided by the embodiment of the present invention.

[0038] As Figure 1 shown, the layer structure of the anti-blue light screen protector of the present invention is successively a resin film, an anti-blue light functional coating provided on the resin film, a release film layer provided on the functional coating, a pressure-sensitive adhesive layer provided under the substrate layer, and a release film layer provided under the pressure-sensitive adhesive layer. EMBODIMENTS

[0039] All raw materials used in the following embodiments of the present invention are commercially available chemical products.

[0040] The performance tests of the anti-blue light screen protectors prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were carried out. The test items and test methods are as follows:

[0041] 1. Transmittance

[0042] The anti-blue light screen protector provided by the present invention was tested for its light transmittance, haze, transmittance at a wavelength of 400 nm, and transmittance at 410 nm according to the standard of JIS K7105-1981 "Test Methods for Optical Properties of Plastics". The test results show that the total light transmittance of the anti-blue light screen protector provided by the present invention is 90% - 91%, the haze is 0.5% - 1.5%, the transmittance at a wavelength of 400 nm is 5% - 8%; the transmittance at 410 nm is 60% - 70%.

[0043] 2. Pencil hardness

[0044] The anti-blue light screen protector provided by the present invention was tested for the pencil hardness of the anti-blue light functional coating according to the test method of GB / T 6739. The test results show that the pencil hardness of the anti-blue light screen protector provided by the present invention is above 2H.

[0045] 3. Scratch resistance test

[0046] The anti-blue light screen protector provided by the present invention was tested by a linear abrasion tester, with steel wool grade HOMAX#0000, pressure 500 g / cm 2 , stroke 3.5 cm, speed 50 revolutions per minute. After abrasion for 50 times, the surface appearance of the anti-blue light functional coating was observed with a magnifying glass for scratches. The test results show that the scratch resistance performance of the anti-blue light screen protector provided by the present invention is qualified.

[0047] 4. Adhesion test

[0048] The anti-blue light screen protector provided by the present invention was tested for its adhesion by using an ISO2409-1992 standard cross-cut knife according to the method of ASTM D3359 "Test Standard for Measuring Adhesion with Tape". The test results show that the adhesion of the anti-blue light screen protector provided by the present invention is 100 / 100, and 100% does not peel off.

[0049] 5. Yellow index test

[0050] The yellow index of the anti-blue light screen protector provided by the present invention was tested using a HunterLab labscanxe yellow index meter in accordance with the standard of HG / T 3862-2006 "Test Method for Yellow Index of Plastics". The test results show that the yellow index of the anti-blue light screen protector provided by the present invention is at an extremely low level without adding oil-soluble transparent blue / violet dyes, and will not cause screen color cast. Example

[0051] A domestic triacetyl cellulose (TAC) resin film with a thickness of 300 μm was used. An anti-blue light functional coating containing organic rare earth light conversion materials with a particle size of 0.8 μm - 6 μm was coated on the front side of the resin film by means of a doctor blade micro-recess coating. First, it was dried in an 80°C oven for 6 minutes, and then cured by ultraviolet light with a light energy intensity of 500 mj / cm 2 to obtain a coating with a thickness of 100 μm. An antistatic PET release film layer with a thickness of 100 μm was laminated on the coating. Among them, the components and mass fractions of the anti-blue light functional coating are: 35 parts of tetrahydrofuran, 35 parts of xylene, 10 parts of thinner (ABIL EM90), 20 parts of bifunctional acrylate (Changxing EM2206-2), 10 parts of polyester acrylate (Sartomer CN2302), 2 parts of photoinitiator (BASF Irgacure184-D), 0.2 parts of leveling agent (BYK-333), and 2 parts of organic rare earth luminescent material (tris[5-(4,4'-dimethyl-2,2'-bipyridin-6-yl)-1,2,3,4-1 H -tetrazolato]europium(III)).

[0052] A pressure-sensitive adhesive layer was coated on the back side of the resin film by means of slot coating. The solvent was removed by baking at 90°C for 2 minutes, and then thermally cured at 160°C to obtain an adhesive layer with a thickness of about 30 μm. An antistatic PET release film layer with a thickness of 100 μm was laminated under the adhesive layer to obtain an anti-blue light screen protector. Among them, the components and mass fractions of the adhesive layer are: 100 parts of methyl silicone pressure-sensitive adhesive (Shenzhen Jipeng Silicon Fluoride Materials Co., Ltd., PSA9165), 65 parts of diluent toluene, and 1.8 parts of catalyst (benzoyl peroxide). Example

[0053] A UV400 type TAC resin film of Konica Minolta with a thickness of 200 μm was used. An anti-blue light functional coating containing organic rare earth light conversion materials with a particle size of 0.8 μm - 6 μm was coated on the front side of the resin film by means of a doctor blade micro-recess coating. First, it was dried in an 80°C oven for 6 minutes, and then cured by ultraviolet light with a light energy intensity of 600 mj / cm 2The ultraviolet-cured coating with a thickness of 80 μm is obtained, and an antistatic PET release film layer with a thickness of 100 μm is laminated on the coating. Among them, the components and mass parts of the blue-light blocking functional coating are: 40 parts of methyl ethyl ketone, 35 parts of toluene, 25 parts of ethoxylated 1,6-hexanediol diacrylate reactive diluent (Changxing EM2211), 20 parts of epoxy acrylate (Sartomer CN104NS), 20 parts of polyether acrylate (BASF PO9026), 2.0 parts of photoinitiator (BASF Darocur1173), 1.5 parts of leveling agent (BYK-UV3500), 0.4 part of reactive self-cleaning additive (Shin-Etsu KY1203), 2 parts of organic rare earth luminescent material (europium(III) tris[5-(4,4'-trifluoromethyl-2,2'-bipyridin-6-yl)-1,2,3,4-1 H -tetrazolato])

[0054] The pressure-sensitive adhesive layer is coated on the back of the resin film by slit coating, the solvent is removed by baking at 80 °C for 4 minutes, and the adhesive layer with a thickness of about 20 μm is obtained by thermosetting at 160 °C. An antistatic PET release film layer with a thickness of 100 μm is laminated under the adhesive layer to obtain a blue-light blocking screen protector. Among them, the components and mass parts of the adhesive layer are: 100 parts of high-transparency PET pressure-sensitive adhesive (Conleybond KL-2620B), 50 parts of diluent xylene, 0.8 part of crosslinking agent (Dow Corning Z-6121), 1.8 parts of catalyst (Dow Corning 4000). Example

[0055] A domestic PET resin film with a thickness of 100 μm is used. The blue-light blocking functional coating added with organic rare earth light conversion materials with a particle size of 0.8 μm - 6 μm is coated on the front of the resin film by a doctor blade microgravure coating method. First, it is dried in an oven at 60 °C for 5 minutes, and then the ultraviolet light with an energy intensity of 500 mj / cm 2 The ultraviolet-cured coating with a thickness of 30 μm is obtained, and an antistatic PET release film layer with a thickness of 100 μm is laminated on the coating. Among them, the components and mass parts of the blue-light blocking functional coating are: mixed solvent (xylene: ethyl acetate: cyclohexanone = 15:3:1) 70 parts, reactive diluent (DSM-2830L) 1 part, reactive diluent (Changxing EM90) 9 parts, polyurethane acrylate (Cytec EB1290) 15 parts, modified epoxy acrylate (Sartomer CN115NS) 15 parts, photoinitiator (Lucirin TPO 1 part and Irgacure 184 1 part) 2 parts, reactive stain-resistant additive (DIC-RS9009) 0.3 part, organic rare earth luminescent material (europium(III) tris[5-(4,4'-dimethoxy-2,2'-bipyridin-6-yl)-1,2,3,4-1 H -tetrazolato]) 1.8 parts

[0056] The pressure-sensitive adhesive layer is coated on the back of the resin film by slit coating, the solvent is removed by baking at 80 °C for 2 minutes, and then thermoset at 110 °C to obtain an adhesive layer with a thickness of about 20 μm. An antistatic PET release film layer with a thickness of 100 μm is laminated under the adhesive layer to obtain a blue light blocking screen protector. Among them, the components and mass parts of the adhesive layer are: 100 parts of dimethylmethylvinylsiloxane (Dow DOWSIL-7666), 50 parts of diluent toluene, 1.0 part of crosslinking agent (Dow SYL-OFF SL 7028), 1.2 parts of catalyst (Dow SYL-OFF 4000), and 1.3 parts of fixing agent (Dow SYL-OFF 297). Example

[0057] 2 parts of organic rare earth luminescent material (europium(III) tris[5-(4,4'-dimethyl-2,2'-bipyridin-6-yl)-1,2,3,4-1 H -tetrazolato]) and 1000 parts of PET material with a melt index of 30 g / 10 min are dried at 150-170 °C for 4-5 hours and then added to a high-speed mixer. After being stirred evenly by the high-speed mixer, it is extruded by a screw extruder with an operating temperature of 270-295 °C and a rotation speed of 150 r / min, and water-cooled granulated to prepare a resin film base material masterbatch. The base material masterbatch is put into a blown film machine, and a PET blue light blocking screen protector with a thickness of 0.6 mm is made through plasticizing extrusion, stretching, traction, and winding at an outlet temperature of 285 °C.

[0058] A domestic triacetate cellulose (TAC) resin film with a thickness of 300 μm is used, and a blue light blocking functional coating added with organic rare earth light conversion materials with a particle size of 0.8 μm - 6 μm is coated on the front of the resin film by bar micro-recess coating. First, it is dried in an 80 °C oven for 6 minutes, and then ultraviolet light with an energy intensity of 500 mj / cm 2 is used for curing and forming to obtain a coating with a thickness of 100 μm, and an antistatic PET release film layer with a thickness of 100 μm is laminated on the coating. Among them, the components and mass parts of the blue light blocking functional coating are: 35 parts of tetrahydrofuran, 35 parts of xylene, 10 parts of thinner (ABIL EM90), 20 parts of bifunctional acrylate (Changxing EM2206-2), 10 parts of polyester acrylate (Sartomer CN2302), 2 parts of photoinitiator (BASF Irgacure184-D), and 0.2 part of leveling agent (BYK-333).

[0059] The pressure-sensitive adhesive layer is coated on the back of the resin film by slit coating, the solvent is removed by baking at 90 °C for 2 minutes, and then thermoset at 160 °C to obtain an adhesive layer with a thickness of about 30 μm. An antistatic PET release film layer with a thickness of 100 μm is laminated under the adhesive layer to obtain a blue light blocking screen protector. Among them, the components and mass parts of the adhesive layer are: 100 parts of methyl silicone pressure-sensitive adhesive (Shenzhen Jipeng Silicon Fluoride Materials Co., Ltd., PSA9165), 65 parts of diluent toluene, and 1.8 parts of catalyst (benzoyl peroxide).

[0060] A UV400 type TAC resin film with a thickness of 200 μm from Konica Minolta is used. A blue light blocking functional coating added with an organic rare earth light conversion material with a particle size of 0.8 μm - 6 μm is coated on the front of the resin film by rod microgravure coating. First, it is dried in an 80 °C oven for 6 minutes, and then cured by ultraviolet light with a light energy intensity of 600 mj / cm 2 to obtain a coating with a thickness of 80 μm. An antistatic PET release film layer with a thickness of 100 μm is laminated on the coating. Among them, the components and mass parts of the blue light blocking functional coating are: 40 parts of methyl ethyl ketone, 35 parts of toluene, 25 parts of ethoxylated 1,6 - hexanediol diacrylate reactive diluent (Changxing EM2211), 20 parts of epoxy acrylate (Sartomer CN104NS), 20 parts of polyether acrylate (BASF PO9026), 2.0 parts of photoinitiator (BASF Darocur1173), 1.5 parts of leveling agent (BYK - UV3500), 0.4 parts of reactive self - cleaning aid (ShinEtsu KY1203), 2 parts of organic small molecule blue light absorbing material mixture (ethyl 2-(4 - benzoyl - 3 - hydroxyphenoxy)acrylate:2-(5 - chloro - 2 - benzotriazolyl)-6 - tert - butyl - p - cresol = 1:1), and 0.01 part of oil - soluble transparent blue dye.

[0061] The pressure-sensitive adhesive layer is coated on the back of the resin film by slit coating, the solvent is removed by baking at 80 °C for 4 minutes, and then thermoset at 160 °C to obtain an adhesive layer with a thickness of about 20 μm. An antistatic PET release film layer with a thickness of 100 μm is laminated under the adhesive layer to obtain a blue light blocking screen protector. Among them, the components and mass parts of the adhesive layer are: 100 parts of high - transparency PET pressure-sensitive adhesive (Conlebone KL - 2620B), 50 parts of diluent xylene, 0.8 part of crosslinking agent (Dow Corning Z - 6121), and 1.8 parts of catalyst (Dow Corning 4000).

[0062] A domestic PET resin film with a thickness of 100 μm is used. A blue light blocking functional coating containing organic rare earth light conversion materials with a particle size of 0.8 μm - 6 μm is coated on the front side of the resin film by means of bar micro-gravure coating. First, it is dried in an oven at 60 °C for 5 minutes, and then cured by ultraviolet light with a light energy intensity of 500 mj / cm 2 to obtain a coating with a thickness of 30 μm. An antistatic PET release film layer with a thickness of 100 μm is laminated on the coating. Among them, the components and mass fractions of the blue light blocking functional coating are: 70 parts of a mixed solvent (xylene: ethyl acetate: cyclohexanone = 15:3:1), 1 part of an active diluent (DSM-2830L), 9 parts of an active diluent (Changxing EM90), 15 parts of polyurethane acrylate (Cytec EB1290), 15 parts of modified epoxy acrylate (Sartomer CN115NS), 2 parts of a photoinitiator (1 part of Lucirin TPO and 1 part of Irgacure 184), 0.3 part of a reactive stain-resistant additive (DIC-RS9009), 0.5 part of an organic rare earth luminescent material (tris[4,4'-bis(6-butoxynaphthyl)-6-(3-phenyl-1 H -1,2,4-triazol-5-yl)-2,2'-bipyridine]europium(III)), 0.4 part of an inorganic rare earth luminescent material (Y2O2S:Eu3+), and 0.01 part of an oil-soluble transparent purple dye.

[0063] A pressure-sensitive adhesive layer is coated on the back side of the resin film by means of slot coating. The solvent is removed by baking at 80 °C for 2 minutes, and then thermoset at 110 °C to obtain an adhesive layer with a thickness of about 20 μm. An antistatic PET release film layer with a thickness of 100 μm is laminated under the adhesive layer to obtain a blue light blocking screen protector. Among them, the components and mass fractions of the adhesive layer are: 100 parts of dimethylmethylvinylsiloxane (Dow DOWSIL-7666), 50 parts of a diluent toluene, 1.0 part of a crosslinking agent (Dow SYL-OFF SL 7028), 1.2 parts of a catalyst (Dow SYL-OFF 4000), and 1.3 parts of a fixing agent (Dow SYL-OFF 297).

[0064] According to the scheme described in the above implementation method, the light transmittance, haze, pencil hardness, scratch resistance, adhesion, and yellow index of the blue light blocking screen protectors prepared in Examples 1 - 3 and Comparative Examples 1 - 3 of the present invention are tested. The test results are shown in Table 1.

[0065] Result analysis: The above test results show that the anti-blue light screen protection film described in the present invention has good scratch resistance and light transmittance. At the same time, due to the addition of the organic rare earth light conversion material, the high-energy blue light protection function of the protection film is realized. For the screen protection film prepared by using the inorganic rare earth luminescent material, although the blue light protection function is also realized, due to the poor compatibility between the inorganic rare earth material and the polymer resin substrate in the anti-blue light functional coating, the light transmittance of the coating decreases, and the clarity and brightness of the display screen are reduced at the product level, greatly reducing the visual effect of the display screen.

[0066] Table 1 Test results of the anti-blue light screen protection films provided in the examples and comparative examples of the present invention

[0067] Transmittance Haze Pencil hardness Scratch resistance Adhesion Yellow index Example 1 90.9% 4.0% 2H No visible scratches after 50 times 100 / 100 3.9 Example 2 90.2% 3.2% 3H No visible scratches after 50 times 100 / 100 3.3 Example 3 91.3% 6.2% 3H No visible scratches after 50 times 100 / 100 4.2 Example 4 82.3% 17.6% / / / 6.9 Comparative example 1 94.0% 2.5% 2H No visible scratches after 50 times 100 / 100 0.2 Comparative example 2 88.2% 13.3% 3H No visible scratches after 50 times 100 / 100 9.7 Comparative example 3 74.6% 18.9% 3H No visible scratches after 50 times 100 / 100 8.6

[0068] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A blue light blocking screen protector, comprising: A resin film, an anti-blue light functional coating disposed on the resin film layer, a release film layer disposed on the anti-blue light functional coating, a pressure-sensitive adhesive layer disposed under the resin film layer, and a release film layer disposed under the pressure-sensitive adhesive layer; characterized in that the components of the anti-blue light functional coating include 15 to 40 parts by mass of a polymer binder, 70 to 150 parts by mass of an organic auxiliary agent, 0.5 to 4 parts by mass of a photoinitiator, and 0.5 to 10 parts by mass of an organic rare earth light conversion material. The organic rare earth light conversion material is a rare earth complex with europium (III) as the central ion and tetrazole as the organic ligand, and its fluorescence emission peaks are at 500 nm and 610 nm respectively, where 610 nm is the maximum emission peak, and red light is emitted under the excitation of 410 nm excitation light.

2. The anti-blue light screen protector according to claim 1, characterized in that, The release film is at least one selected from a BOPP layer, a PP layer, and a PE layer.

3. The anti-blue light screen protector according to claim 2, wherein The resin film is selected from a polyethylene terephthalate film, a polycarbonate film, a polyacrylic resin film, an acid cellulose film, or an acrylic film.

4. The anti-blue light screen protector according to claim 1, wherein The polymer binder material is at least one selected from polyester acrylate, polyether acrylate, and polyurethane acrylate, the organic auxiliary agent is at least one selected from toluene, xylene, tetrahydrofuran, ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, monofunctional acrylate or methacrylate, bifunctional acrylate or methacrylate, and 4-6 functional acrylate or methacrylate, and the photoinitiator is at least one selected from ethyl benzoyl lactate initiators, α -hydroxy ketone initiators.

5. The anti-blue light screen protector according to claim 1, wherein The thickness of the anti-blue light functional coating is 150 μm to 250 μm.

6. The anti-blue light screen protector according to claim 1, characterized in that, The particle size range of the organic rare earth light conversion material particles is selected from 0.1 μm - 10 μm.

7. The anti-blue light screen protector according to any one of claims 1-6, characterized in that, The organic rare earth light conversion material is tris[5-(4,4'-dimethyl-2,2'-bipyridin-6-yl)-1,2,3,4-1 H -tetrazolato]europium(III), tris[5-(4,4'-trifluoromethyl-2,2'-bipyridin-6-yl)-1,2,3,4-1 H -tetrazolato]europium(III) or tris[5-(4,4'-dimethoxy-2,2'-bipyridin-6-yl)-1,2,3,4-1 H -tetrazolato]europium(III).

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