A UV optical film material, manufacturing method and application

Abstract

The application belongs to the field of electronic display film materials, and discloses a UV optical film material and a manufacturing method and application thereof. The UV optical film material comprises a base material, a frosted layer, an inner protective film layer, an optical ink layer, a transparent adhesive layer and an outer protective film layer. The frosted layer and the inner protective film layer are coated on the inner surface of the base material in sequence from outside to inside. The optical ink layer, the transparent adhesive layer and the outer protective film layer are coated on the outer surface of the base material in sequence from outside to inside. The coating process is as follows: the viscosity of the UV optical ink is controlled at 16''-18'', the UV optical ink is coated on the outer surface of the base material by using a precise micro-concave ceramic coating roller, and then UV curing is performed to form the optical ink layer. The transparent adhesive layer is coated on the surface of the optical ink layer, and after curing, the UV optical transfer adhesive is coated on the inner surface of the base material to form the frosted layer. Finally, the inner protective film layer and the outer protective film layer are respectively coated on the surface of the frosted layer and the surface of the transparent adhesive layer. The application has the characteristics of high hardness and high adhesion, the surface can be kept uniform, the edge sharpness is high, and discoloration can be effectively prevented.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electronic display film processing, and particularly relates to a UV optical film and a manufacturing method and application thereof. BACKGROUND

[0002] In the field of manufacturing liquid crystal display screens and flexible photoelectric display screens, optical functional films (such as brightness enhancement films, quantum dot films and surface protection films) are attached to the surface of the screen for protection and to improve the display performance of the screen. The optical functional films usually use polyethylene terephthalate (PET), polycarbonate (PC) or triacetate cellulose (TAC) as a transparent substrate, and optical ink is coated on the surface of the transparent substrate to form a transparent optical functional protection film. At present, ultraviolet curing (UV) coating technology has become the mainstream in the industry due to its excellent performance. The use of ultraviolet curing (UV) optical coating technology is the core process for preparing functional optical films such as brightness enhancement films and quantum dot films. In comparison, the traditional micro-concave coating process has technical bottlenecks such as insufficient coating uniformity and microstructure transfer defects, and has been difficult to meet the stringent requirements of high-resolution display devices for the performance of optical films. Therefore, ultraviolet curing (UV) coating technology has gradually replaced the traditional micro-concave coating process due to its advantages such as efficient curing and low energy consumption. However, the current ultraviolet curing (UV) coating technology still has the problems of uneven curing, differences in curing degree caused by uneven distribution of ultraviolet light intensity, difficulty in controlling micro-morphology, and insufficient edge sharpness when transferring high-resolution patterns. SUMMARY

[0003] The purpose of the present application is to provide a UV optical film and a manufacturing method and application thereof. The UV optical film has good bending stress, high hardness and high adhesion, a uniform surface, high edge sharpness, and can effectively prevent discoloration. The coating process has good leveling and wetting properties. In order to achieve the above purpose, the application adopts the following technical effects:

[0004] According to one aspect of the present application, a UV optical film is provided. The UV optical film includes a substrate, a frosted layer, an inner protective film layer, an optical ink layer, a transparent adhesive layer and an outer protective film layer. The frosted layer and the inner protective film layer are coated on the inner surface of the substrate in sequence from inside to outside. The optical ink layer, the transparent adhesive layer and the outer protective film layer are coated on the outer surface of the substrate in sequence from inside to outside.

[0005] The transparent adhesive layer is preferably UVOCA adhesive with a thickness of 50-150 microns. The substrate is preferably a PET film substrate with a thickness of 100-200 microns. The inner protective film layer and the outer protective film layer are preferably made of PET material with a thickness of 0.2-1 mm.

[0006] Further preferably, the above scheme, the sanding layer is made of UV optical transfer glue, and the thickness of the sanding layer is 8-20 μm.

[0007] Further preferably, the above scheme, the UV optical transfer glue is made of the following materials with the following mass fractions: UV polyester acrylate 1-25%, UV modified epoxy acrylate 30-45%, photoinitiator 4-8%, polyurethane acrylate 1-45%, and UV monomer 6-25%. The photoinitiator is TPO initiator or 1-hydroxycyclohexyl phenyl ketone. The UV monomer is one or more of HHDA 1,6-hexanediol diacrylate, ACMO acryloyl morpholine, and THFA tetrahydrofuran acrylate. The UV monomer, also known as reactive diluent, is a key component of UV curing systems (such as inks, coatings, and adhesives). The functions of the UV monomer include adjusting the performance of the system, promoting the curing reaction, and optimizing the film forming properties. The UV monomer can dilute the UV resin, promote the curing reaction, reduce the shrinkage, and increase the adhesion. The preparation process of the UV optical transfer glue includes the following steps:

[0008] Step 10: After stirring the UV polyester acrylate and the UV modified epoxy acrylate in a reaction kettle for 10-30 min and standing for 5-10 min, the photoinitiator is added after heating to 50-70℃. Then, the mixture is stirred at a speed of 1500-2500 rpm for 10-20 min, and then the polyurethane acrylate is added in three times to mix the mixture.

[0009] Step 11: The UV monomer is added to the mixture in step 10 under nitrogen protection. After stirring at a speed of 800-1000 rpm for 20-30 min, the mixture is transferred to a vacuum filter tank for defoaming and filtering. Then, the UV optical transfer glue is obtained after aging at 35-45℃ for 5-10 hours.

[0010] Further preferably, in step 11, the filtering is performed in two stages in a polypropylene filter with a pore size of 5-15 μm.

[0011] Further preferably, the optical ink layer is made of the following mass fractions of optical ink materials: UV polyester acrylate 15-30%, UV modified epoxy acrylate 25-40%, spiropyran-based compound 10-23%, mixed solvent 11-22%, photoinitiator 3-7%, active amine 4-8%, leveling agent 0.4-1%, pigment 2-7%, dispersant 0.6-2.5%; in the present application, the acrylate hydroxyl value of the UV polyester acrylate is 60±5 mg KOH / g; the epoxy equivalent weight of the UV modified epoxy acrylate is 450-500 g / mol; the mixed solvent is a mixture of ethyl acetate, butyl acetate and PMA propylene glycol monomethyl ether acetate in a mass ratio of 1:4-8:10-15; the mixed solvent can dilute the UV polyester acrylate and the UV modified epoxy acrylate, not only adjusting the viscosity, but also quickly drying and leveling after being coated on the surface of the PET film substrate; in the present application, the leveling agent is a polyether-modified siloxane polymer or a perfluorobutyl ethyl acrylate; it can adjust the ink flowability and surface tension; the polyether-modified siloxane (such as polydimethylsiloxane) can improve the ink flowability, direct the ink flow, and improve the slipperiness and scratch resistance; the perfluorobutyl ethyl acrylate can reduce the ink viscosity, make the bubbles escape quickly, and achieve the functions of defoaming and leveling. In the present application, the active amine is N-methyldiethanolamine or triethanolamine; the amine group of N-methyldiethanolamine can capture the peroxide radicals generated by ultraviolet photolysis, block the oxidation chain reaction; the amine group of triethanolamine can form a donor-acceptor complex with the spiropyran open ring body, inhibit the degradation of the chromophore; the active amine not only promotes the initiation efficiency of the photoinitiator and improves the ink curing hardness, but also inhibits oxygen inhibition when participating in the reaction of the UV polyester acrylate, the spiropyran group compound, etc., blocks the oxidation path of the spiropyran, prevents the ink from yellowing, and thus improves the stability of the ink dispersion system.

[0012] Further preferably, the photoinitiator is 1-hydroxycyclohexyl phenyl ketone or TPO initiator, also known as photoinitiator 184 and UV-184, and the TPO chemical name is 2,4,6-trimethylbenzyl-diphenyl phosphine; the photolysis product of TPO is trimethylbenzoyl radical and diphenyl phosphine radical, and the absorption wavelength of the photolysis product moves to the short wave, has the effect of photobleaching, and is beneficial to the transmission of ultraviolet light; in the present application, the photoinitiator can absorb light waveband radiant energy, excite chemical reaction, initiate free radical polymerization ability, and produce intermediate substances, which can initiate polymerization of the ultraviolet light curing system under ultraviolet light irradiation, and can inhibit the long-term non-yellowing effect of the ink; the TPO as the photoinitiator cooperates with the active amine to improve the deep curing efficiency and avoid yellowing caused by migration of unreacted monomers; the compound containing the spiropyran group is one or more of undecylenoyloxy spiropyran, N-hydroxyethyl spiropyran ester of acrylic acid, polyurethane containing dihydroxy spiropyran, and polyurethane containing spiropyran; the compound containing the spiropyran group exhibits the effect of ultraviolet photochromism, the open ring structure of the spiropyran emits orange-red fluorescence under ultraviolet light irradiation, and is easy to observe; when strong light irradiates on the surface of the spiropyran compound, the spiropyran can absorb ultraviolet in the strong light, thereby improving the antioxidant property and significantly enhancing the fatigue resistance; the spiropyran in the closed ring state absorbs yellow light of 480-600 nm, which has a significant effect of offsetting the yellowing caused by amine oxidation; the spiropyran can absorb bending stress and reduce the generation of cracks; the UV modified epoxy acrylate can improve the surface hardness as a rigid skeleton.

[0013] In the present application, the preparation process of the optical ink material comprises the following steps:

[0014] After the compound containing the spiropyran group is heated to 50-70℃, the UV modified epoxy acrylate is added for premixing for 30 min, and then cooled to 35-45℃, and the UV polyester acrylate is added for mixing to obtain a premix;

[0015] The mixed solvent, the dispersant and the pigment are mixed and ground into nanometer powder fine material, and then the nanometer powder fine material is added to the premix for mixing and stirring, and then heated to 80-85℃, and then the active amine and the leveling agent are added for mixing and stirring for 20 min, and then ultrasonic oscillation is used for dispersion for 10 min, and then cooled to 30-35℃, and then stored in the dark for 10-20 days to obtain the optical ink layer material.

[0016] Further preferably, the particle size of the nanometer powder fine material is 200-400 nm, and the viscosity of the polyurethane acrylate is controlled to be 15000-20000 mPa·s.

[0017] Further preferably, the UV optical transfer adhesive is made of the following materials by mass fraction: UV polyester acrylate 15%, UV modified epoxy acrylate 35%, photoinitiator 5%, polyurethane acrylate 30%, and UV monomer 15%, and the thickness of the frosted layer is 12 microns.

[0018] According to another aspect of the present application, the present application provides a method for manufacturing a UV optical film, comprising the following steps:

[0019] First, configure the UV optical ink, control the viscosity of the UV optical ink at 16" to 18", put the UV optical ink into the nano coating machine, use a precise micro-concave ceramic coating roller to coat the UV optical ink on the outer surface of the substrate 1, and then send it under a 10kw power mercury lamp for UV curing to form an optical ink layer;

[0020] Coat a transparent adhesive layer on the surface of the optical ink layer, and after curing, coat a UV optical transfer adhesive on the inner surface of the substrate to form a frosted layer;

[0021] Coat an inner protective film layer and an outer protective film layer on the surface of the frosted layer and the surface of the transparent adhesive layer respectively, and dry to obtain a UV optical film.

[0022] Further preferably, the UV optical ink is coated on the outer surface of the substrate 1 using a micro-concave ceramic roller with 180 to 220 mesh and 45° diagonal stripes, and the micro-concave ceramic roller has a bounce range of ≤5 microns; the coating temperature is controlled at 70°C to 100°C.

[0023] Further preferably, the coating temperature is controlled in three temperature zones: preheating zone 80±5°C, coating zone 85±3°C, and leveling zone 95±5°C, and the coating speed is between 15 to 25 m / min.

[0024] In the present application, the prepared UV optical transfer adhesive and optical ink are respectively coated on the surface of the PET film substrate, and then accelerated drying and curing are performed under ultraviolet light to form a light diffusion film. UV polyester acrylate is used as a flexible matrix of the light diffusion film to absorb bending stress. Each polyester acrylate branched structure molecule contains 3 to 5 acrylate groups. The branched structure of the polyester acrylate and the UV modified epoxy acrylate form a gradient crosslinking during UV curing, the surface area has a high crosslinking density to achieve 4H hardness, and the high-branched polyester near the substrate ensures the adhesion between each layer.

[0025] In the present application, the UV optical film is applied in a light diffusion film, which is used in all electronic display screens, such as in the display screens of televisions, vehicle displays, smart watches, mobile phones, household appliances, and AI glasses. The UV optical film can reduce damage when applied to the surface of an electronic display screen.

[0026] In summary, the present invention has the following technical effects:

[0027] (1) The ink of the present invention is coated on the surface of PET film substrate and forms an optical ink layer and a frosted layer after drying and curing. It can significantly increase the AG effect on the surface, and the light will not directly harm the eyes. Its surface is not easily scratched. The optical ink has excellent leveling and wetting properties and has the characteristics of high hardness and high adhesion. The optical ink coated on the PET film substrate has excellent bending stress and toughness, and can also effectively prevent discoloration, fingerprint resistance and scratch resistance.

[0028] (2) The frosted layer material and optical ink layer material of the present invention are coated on the PET film substrate and then cured by ultraviolet light curing (UV) coating technology. The surface can remain uniform and the edge sharpness is high, which greatly improves the clarity. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a UV optical film material according to the present invention;

[0030] In the attached diagram, 1 is the substrate, 2 is the frosted layer, 3 is the inner protective film layer, 4 is the optical ink layer, 5 is the transparent adhesive layer, and 6 is the outer protective film layer. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of the invention, and these aspects of the invention can be achieved even without these specific details.

[0032] Example 1, such as Figure 1 As shown, according to the invention, a UV optical film material includes a substrate 1, a frosted layer 2, an inner protective film layer 3, an optical ink layer 4, a transparent adhesive layer 5, and an outer protective film layer 6. The frosted layer and the inner protective film layer are sequentially coated from the inner surface of the substrate 1 outwards, and the optical ink layer, the transparent adhesive layer, and the outer protective film layer are sequentially coated from the outer surface of the substrate 1 outwards. The transparent adhesive layer 5 is a UVOCA adhesive with a thickness of 50 μm. The substrate 1 is a PET film substrate with a thickness of 100 μm. The inner protective film layer 3 and the outer protective film layer 6 are made of PET material with a thickness of 0.2 mm.

[0033] In the embodiment, the sanding layer 2 is made of UV optical transfer glue with a thickness of 8 μm; the UV optical transfer glue is made of materials with the following mass fractions: UV polyester acrylate 25%, UV modified epoxy acrylate 45%, photoinitiator 4%, polyurethane acrylate 1%, and UV monomer 25%, the viscosity of the polyurethane acrylate is controlled at 15000 mPa·s; the preparation process of the UV optical transfer glue includes the following steps:

[0034] Step 10: After stirring the UV polyester acrylate and the UV modified epoxy acrylate in the reaction kettle for 10 min and standing for 10 min, the temperature is increased to 50℃, the photoinitiator is added, and then stirred at a speed of 2500 rpm for 10 min, and then the polyurethane acrylate is added in three times under the stirring speed of 400 rpm, wherein the first time adds 25% of the total mass of the polyurethane acrylate, the second time adds 45% of the total mass, and the third time adds 30% of the total mass of the total mass, to obtain a mixed glue liquid;

[0035] Step 11: Under the protection of nitrogen, the UV monomer is added to the mixed glue liquid in step 10, stirred at a speed of 800 rpm for 30 min, then transferred to a vacuum filter tank for degassing and filtration, and then taken out, and then aged at 35℃ for 10 hours to obtain the UV optical transfer glue; wherein the filtration in the vacuum filter tank is two-stage filtration using a 5 μm polypropylene filter in the vacuum filter tank.

[0036] In the embodiment, the optical ink layer 4 is made of optical ink materials with the following mass fractions: UV polyester acrylate 15%, UV modified epoxy acrylate 30%, compound containing spiropyran group 23%, mixed solvent 18%, photoinitiator 3%, active amine 5%, leveling agent 0.8%, pigment 4%, and dispersing agent 1.2%, the compound containing spiropyran group is a double-hydroxyl spiropyran polyurethane or a spiropyran-containing polyurethane, and the leveling agent is a polyether-modified siloxane polymer; the preparation process of the optical ink materials includes the following steps:

[0037] Step 20, after heating the compound containing spiropyran group to 50℃, the UV modified epoxy acrylate is added for pre-mixing for 30 min, and then cooled to 35℃, the UV polyester acrylate is added for mixing uniformly to obtain a pre-mixed material;

[0038] Step 21, the mixed solvent is mixed with the dispersant and the pigment to form a nano-powder fine material, wherein the particle size of the nano-powder fine material is 200 nm, the nano-powder fine material is then added to the premix for mixing and stirring at a stirring speed of 500 rpm for 30 min, then heated to 80°C, and then sequentially added with the active amine and the leveling agent for mixing and stirring for 20 min, after the stirring is completed, ultrasonic oscillation is used for dispersion for 10 min, then cooled to 30°C, and stored in the dark for 10 days to obtain the optical ink layer material.

[0039] According to another aspect of the present application, the present application provides a manufacturing method of a UV optical film material, the manufacturing method comprising the following steps:

[0040] Step 30, first configure the UV optical ink, the viscosity of the UV optical ink is controlled to be 16"~18", the UV optical ink is placed in a nano-coating machine, and a precise micro-concave ceramic coating roller is used to coat the UV optical ink on the outer surface of the substrate 1, wherein the micro-concave ceramic roller with 180 meshes and 45° diagonal stripes is used to coat the UV optical ink on the outer surface of the substrate 1, the jumping range of the micro-concave ceramic roller is ≤5 μm, then sent to a 10 kw power mercury lamp for UV curing to form an optical ink layer 4; wherein the coating temperature of the UV optical ink on the outer surface of the substrate 1 is controlled in three temperature zones, the temperature zone distribution is: preheating zone 80±5°C, coating zone 84±3°C, and leveling zone 95±5°C, and the coating speed is 15 m / min;

[0041] Step 31, coat a transparent adhesive layer 5 on the surface of the optical ink layer 4, and after curing, coat a UV optical transfer adhesive on the inner surface of the substrate 1 to form a frosted layer;

[0042] Step 32, coat an inner protective film layer 3 and an outer protective film layer 6 on the surface of the frosted layer and the surface of the transparent adhesive layer 5 respectively, and dry to obtain a UV optical film material.

[0043] Example 2, as shown in Figure 1 the UV optical film material according to the present application, the UV optical film material comprises a substrate 1, a frosted layer 2, an inner protective film layer 3, an optical ink layer 4, a transparent adhesive layer 5, and an outer protective film layer 6, the frosted layer and the inner protective film layer are sequentially coated from the inner surface of the substrate 1 to the outside, and the optical ink layer, the transparent adhesive layer, and the outer protective film layer are sequentially coated from the outer surface of the substrate 1 to the outside; the transparent adhesive layer 5 is a UVOCA adhesive with a thickness of 150 μm, the substrate 1 is a PET film substrate with a thickness of 200 μm, and the inner protective film layer 3 and the outer protective film layer 6 are made of PET material with a thickness of 1 mm.

[0044] In the embodiment, the sanding layer 2 is made of UV optical transfer glue with a thickness of 20 μm; the UV optical transfer glue is made of materials with the following mass fractions: UV polyester acrylate 1%, UV modified epoxy acrylate 40%, photoinitiator 8%, polyurethane acrylate 45%, and UV monomer 6%; the viscosity of the polyurethane acrylate is controlled at 20,000 mPa·s, and the preparation process of the UV optical transfer glue comprises the following steps:

[0045] Step 10: After stirring the UV polyester acrylate and the UV modified epoxy acrylate in a reaction kettle for 30 min and standing for 5 min, the temperature is increased to 70℃, the photoinitiator is added, and stirring is performed at a rotation speed of 1,500 rpm for 20 min, and then the polyurethane acrylate is added in three times under the condition of a stirring speed of 600 rpm, wherein the first time, 30% of the total mass of the polyurethane acrylate is added, the second time, 50% of the total mass is added, and the third time, 20% of the total mass of the total mass is added, to obtain a mixed glue solution;

[0046] Step 11: The UV monomer is added to the mixed glue solution in step 10 under nitrogen protection, stirring is performed at a rotation speed of 1,000 rpm for 20 min, and then the UV optical transfer glue is obtained by deaerating and filtering in a vacuum filter tank and then aging at 45℃ for 5 hours; wherein the filtering in the vacuum filter tank is performed by using a polypropylene filter core with a size of 15 μm for two-stage filtering.

[0047] In the present application, the optical ink layer 4 is made of optical ink materials with the following mass fractions: UV polyester acrylate 30%, UV modified epoxy acrylate 35%, spiropyran group-containing compound 10%, mixed solvent 11%, photoinitiator 7%, active amine 4%, leveling agent 0.4%, pigment 2%, and dispersant 0.6%; the spiropyran group-containing compound is undecylenoyloxy spiropyran or N-hydroxyethyl spiropyran ester, and the leveling agent is perfluorobutyl ethyl acrylate; the preparation process of the optical ink materials comprises the following steps:

[0048] Step 20: After heating the spiropyran group-containing compound to 70℃, the UV modified epoxy acrylate is added for pre-mixing for 30 min, the temperature is cooled to 45℃, the UV polyester acrylate is added for mixing, and a pre-mixed material is obtained;

[0049] Step 21, the mixed solvent is mixed with the dispersant and the pigment to form a nano-powder fine material, wherein the particle size of the nano-powder fine material is 400 nm, then the nano-powder fine material is added to the premix for mixing and stirring at a stirring speed of 800 rpm for 30 min, then heated to 85°C, and then sequentially added with the active amine and the leveling agent for mixing and stirring for 20 min, and then dispersed by ultrasonic oscillation for 10 min after completion of the stirring, and then cooled to 35°C, and then stored in the dark for 20 days to obtain the optical ink layer material.

[0050] According to another aspect of the present application, the present application provides a manufacturing method of a UV optical film material, the manufacturing method comprising the following steps:

[0051] Step 30, first configure the UV optical ink, the viscosity of the UV optical ink is controlled to be 16"~18", the UV optical ink is placed in a nano-coating machine, and a precise micro-concave ceramic coating roller is used to coat the UV optical ink on the outer surface of the base material 1, wherein the micro-concave ceramic roller used for coating the UV optical ink on the outer surface of the base material 1 has 220 meshes and 45° diagonal lines, the jumping range of the micro-concave ceramic roller is ≤5μm, then the UV optical ink is sent to a 10kw power mercury lamp for UV curing to form an optical ink layer 4; wherein the coating temperature for coating the UV optical ink on the outer surface of the base material 1 is controlled in three temperature zones, the temperature zone distribution is: a preheating zone of 80±5°C, a coating zone of 85±3°C, and a leveling zone of 95±5°C, and the coating speed is 25m / min;

[0052] Step 31, coat a transparent adhesive layer 5 on the surface of the optical ink layer 4, and after curing, coat a UV optical transfer adhesive on the inner surface of the base material 1 to form a frosted layer;

[0053] Step 32, coat an inner protective film layer 3 and an outer protective film layer 6 on the surface of the frosted layer and the surface of the transparent adhesive layer 5 respectively, and then dry to obtain a UV optical film material.

[0054] As shown in Figure 1 the UV optical film material according to the present application, the UV optical film material comprises a base material 1, a frosted layer 2, an inner protective film layer 3, an optical ink layer 4, a transparent adhesive layer 5, and an outer protective film layer 6, the frosted layer and the inner protective film layer are sequentially coated from the inner surface of the base material 1 to the outside, and the optical ink layer, the transparent adhesive layer, and the outer protective film layer are sequentially coated from the outer surface of the base material 1 to the outside; the transparent adhesive layer 5 is a UVOCA adhesive, and the thickness thereof is 100μm; the base material 1 is a PET film base material, and the thickness thereof is 150μm; the inner protective film layer 3 and the outer protective film layer 6 are made of PET material, and the thicknesses thereof are 0.8mm.

[0055] In the embodiment, the sanding layer 2 is made of UV optical transfer glue with a thickness of 15 μm; the UV optical transfer glue is made of materials with the following mass fractions: UV polyester acrylate 20%, UV modified epoxy acrylate 30%, photoinitiator 6%, polyurethane acrylate 26%, and UV monomer 18%, the viscosity of the polyurethane acrylate is controlled at 18000 mPa·s; the preparation process of the UV optical transfer glue includes the following steps:

[0056] Step 10: After stirring the UV polyester acrylate and the UV modified epoxy acrylate in the reaction kettle for 20 min and standing for 8 min, the temperature is increased to 65℃, the photoinitiator is added, and after stirring at a speed of 2000 rpm for 15 min, the polyurethane acrylate is added in three times, wherein the first time is 35% of the total mass of the polyurethane acrylate, the second time is 50% of the total mass, and the third time is 15% of the total mass of the total mass, to obtain a mixed glue liquid;

[0057] Step 11: Under the protection of nitrogen, the UV monomer is added to the mixed glue liquid in step 10, stirred at a speed of 900 rpm for 25 min, then transferred to a vacuum filter tank for degassing and filtering, and then aged at 40℃ for 8 hours to obtain the UV optical transfer glue; wherein the filtering in the vacuum filter tank is two-stage filtering using a 12 μm polypropylene filter in the vacuum filter tank.

[0058] In the embodiment, the optical ink layer 4 is made of optical ink materials with the following mass fractions: UV polyester acrylate 20%, UV modified epoxy acrylate 25%, spiropyran group-containing compound 15%, mixed solvent 22%, photoinitiator 5%, active amine 6%, leveling agent 0.5%, pigment 5%, and dispersing agent 2.5%, the spiropyran group-containing compound is a polyurethane containing a dihydroxy spiropyran or undecylenoyloxy spiropyran, and the leveling agent is a polyether-modified siloxane polymer; the preparation process of the optical ink materials includes the following steps:

[0059] Step 20, the spiropyran group-containing compound is heated to 60℃, then the UV modified epoxy acrylate is added for pre-mixing for 30 min, then cooled to 40℃, and the UV polyester acrylate is added for mixing to obtain a pre-mixed material;

[0060] Step 21: Mix the mixed solvent, dispersant, and pigment into nano-powder fines with a particle size of 300 nm. Add the nano-powder fines to the premix and mix and stir at 600 rpm for 30 min. Then heat to 82°C and add active amine and leveling agent in sequence for 20 min. After stirring, disperse using ultrasonic vibration for 10 min and then cool to 32°C. After 15 days of light-shielding storage, obtain the optical ink layer material.

[0061] According to another aspect of the present invention, the present invention provides a method for manufacturing a UV optical film, the method comprising the following steps:

[0062] Step 30: First, prepare the UV optical ink. The viscosity of the UV optical ink is controlled at 16"~18". Place the UV optical ink into a nano-coating machine and use a precision micro-grooved ceramic coating roller to coat the UV optical ink on the outer surface of the substrate 1. The coating of the UV optical ink on the outer surface of the substrate 1 is carried out using a micro-grooved ceramic roller with 200 mesh and 45° diagonal grooves. The runout range of the micro-grooved ceramic roller is ≤5μm. Then, it is sent to a 10kW mercury lamp for UV curing to form the optical ink layer 4. The coating temperature of the UV optical ink coating on the outer surface of the substrate 1 is controlled in three temperature zones: preheating zone 80±5℃, coating zone 86±3℃, and leveling zone 95±3℃. The coating speed is 20m / min.

[0063] Step 31: Apply a transparent adhesive layer 5 to the surface of the optical ink layer 4. After curing, apply a UV optical transfer adhesive to the inner surface of the substrate 1 to form a frosted layer.

[0064] Step 32: Apply inner protective film layer 3 and outer protective film layer 6 to the surface of frosted layer and transparent adhesive layer 5 respectively, and dry to obtain UV optical film material.

[0065] Example 4, as Figure 1 As shown, according to the invention, a UV optical film material includes a substrate 1, a frosted layer 2, an inner protective film layer 3, an optical ink layer 4, a transparent adhesive layer 5, and an outer protective film layer 6. The frosted layer and the inner protective film layer are sequentially coated from the inner surface of the substrate 1 outwards, and the optical ink layer, the transparent adhesive layer, and the outer protective film layer are sequentially coated from the outer surface of the substrate 1 outwards. The transparent adhesive layer 5 is a UVOCA adhesive with a thickness of 80 μm. The substrate 1 is a PET film substrate with a thickness of 170 μm. The inner protective film layer 3 and the outer protective film layer 6 are made of PET material with a thickness of 0.6 mm.

[0066] In the embodiment, the sanding layer 2 is made of UV optical transfer glue with a thickness of 12 μm; the UV optical transfer glue is made of materials with the following mass fractions: UV polyester acrylate 15%, UV modified epoxy acrylate 35%, photoinitiator 5%, polyurethane acrylate 30%, and UV monomer 15%, the viscosity of the polyurethane acrylate is controlled at 16000 Pa·s; the preparation process of the UV optical transfer glue includes the following steps:

[0067] Step 10: After stirring the UV polyester acrylate and the UV modified epoxy acrylate in the reaction kettle for 15 min and standing for 8 min, the temperature is increased to 60℃, the photoinitiator is added, and then stirring is performed at a speed of 1800 rpm for 12 min, and then the polyurethane acrylate is added in three times, wherein the first time is 40% of the total mass of the polyurethane acrylate, the second time is 40% of the total mass, and the third time is 20% of the total mass of the total mass of the polyurethane acrylate, to obtain a mixed glue solution;

[0068] Step 11: Under the protection of nitrogen, the UV monomer is added to the mixed glue solution in step 10, and stirring is performed at a speed of 850 rpm for 22 min, and then the mixed glue solution is transferred to a vacuum filter tank for defoaming and filtering, and then the mixed glue solution is taken out, and then the mixed glue solution is aged at 38℃ for 6 hours to obtain the UV optical transfer glue; wherein the filtering in the vacuum filter tank is performed by using a polypropylene filter core with a size of 10 μm for two-stage filtering.

[0069] In the embodiment, the optical ink layer 4 is made of optical ink materials with the following mass fractions: UV polyester acrylate 15%, UV modified epoxy acrylate 32%, spiropyran group-containing compound 18%, mixed solvent 15%, photoinitiator 3%, active amine 8%, leveling agent 1%, pigment 7%, and dispersing agent 1%, the spiropyran group-containing compound is spiropyran-containing polyurethane or N-hydroxyethyl spiropyran ester, and the leveling agent is perfluorobutyl ethyl acrylate; the preparation process of the optical ink materials includes the following steps:

[0070] Step 20, after heating the spiropyran group-containing compound to 62℃, the UV modified epoxy acrylate is added for pre-mixing for 30 min, and then the UV polyester acrylate is added for mixing uniformly after cooling to 38℃ to obtain a pre-mixed material;

[0071] Step 21, the mixed solvent is mixed with the dispersant and the pigment to form a nano-powder fine material, wherein the particle size of the nano-powder fine material is 320 nm, the nano-powder fine material is then added to the premix for mixing and stirring at a stirring speed of 650 rpm for 30 min, then heated to 82℃, and then the active amine and the leveling agent are sequentially added for mixing and stirring for 20 min, after the stirring is completed, ultrasonic oscillation is used for dispersion for 10 min, then cooled to 32℃, and the optical ink layer material is obtained after light shielding storage for 12 days.

[0072] According to another aspect of the present application, the present application provides a manufacturing method of a UV optical film material, comprising the following steps:

[0073] Step 30, first configure the UV optical ink, the viscosity of the UV optical ink is controlled to be 16"~18", the UV optical ink is placed in a nano-coating machine, a precise micro-concave ceramic coating roller is used to coat the UV optical ink on the outer surface of the substrate 1, wherein the micro-concave ceramic roller with 210 meshes and 45° diagonal stripes is used to coat the UV optical ink on the outer surface of the substrate 1, the jumping range of the micro-concave ceramic roller is ≤5μm, then sent to a 10kw power mercury lamp for UV curing to form an optical ink layer 4; the coating temperature of the UV optical ink coated on the outer surface of the substrate 1 is controlled in three temperature zones, the temperature zone distribution is: preheating zone 75±5℃, coating zone 83±3℃, and leveling zone 92±5℃, and the coating speed is 18m / min;

[0074] Step 31, a transparent adhesive layer 5 is coated on the surface of the optical ink layer 4, after curing, a UV optical transfer adhesive is coated on the inner surface of the substrate 1 to form a frosted layer;

[0075] Step 32, an inner protective film layer 3 and an outer protective film layer 6 are respectively coated on the surface of the frosted layer and the surface of the transparent adhesive layer 5, and the UV optical film material is obtained after drying.

[0076] After the coating of the frosted layer 2 and the optical ink layer 4 on the two side surfaces of the substrate 1 is completed, three Ling pencil tests, THB test 500H verification, PCT aging test and QUV aging test are sequentially performed, the UV optical film material of the present application has excellent transparency, and the adhesion to the two side surfaces of the UV optical film material reaches 5B requirement, and the test results are shown in Table 1:

[0077] Table 1: Test results table

[0078]

[0079] In addition, after the sanding layer 2 and the optical ink layer 4 are coated on both sides of the substrate 1, the optical transmittance measuring instrument is used for detection, the left, middle and right, front and back transmittance difference cannot be greater than 0.5%; the color difference instrument is used for color detection by using the spectrophotometer, the values of the CIELAB color space coordinates L, A and B of each batch are consistent, and the color difference value ΔE is not more than 0.3; the test method for the adhesion test is that the 3M tape is used for testing when the 1mm*1mm size is tested by the cross-hatch knife, the surface color is not pulled off, and the whole test result meets the requirements. The test results in Table 1 show that the UV optical film material has high hardness, scratch resistance and good optical performance, the 2H adhesion does not change after the UV optical film material is boiled for 2 hours, and the surface does not become white.

[0080] The above only describes the preferred embodiments of the application, and it should be noted that those skilled in the art can make some improvements and refinements without departing from the principles of the application, and these improvements and refinements should also be considered as the protection scope of the application.

Claims

1. A UV optical film material, characterized in that: The UV optical film material includes a substrate, a frosted layer, an inner protective film layer, an optical ink layer, a transparent adhesive layer, and an outer protective film layer. The frosted layer and the inner protective film layer are sequentially coated from the inner surface of the substrate outwards. The optical ink layer, the transparent adhesive layer, and the outer protective film layer are sequentially coated from the outer surface of the substrate outwards. The frosted layer is made of UV optical transfer adhesive, which is composed of the following materials in the indicated mass fractions: 1-25% UV polyester acrylate, 30-45% UV modified epoxy acrylate, 4-8% photoinitiator, 1-45% polyurethane acrylate, and 6-25% UV monomer. The preparation process of the UV optical transfer adhesive includes the following steps: Step 10: Add UV polyester acrylate and UV modified epoxy acrylate to the reaction vessel and stir for 10-30 min, then let stand for 5-10 min. Then heat to 50-70℃ and add photoinitiator. Stir for 10-20 min at 1500-2500 rpm, then add polyurethane acrylate in three batches at 400-600 rpm to obtain a mixed adhesive solution. Step 11: Under nitrogen protection, add the UV monomer to the mixed adhesive solution in step 10. Stir at 800-1000 rpm for 20-30 minutes, then transfer to a vacuum filter tank for degassing and filtration. After aging at 35-45℃ for 5-10 hours, obtain the UV optical transfer adhesive. The optical ink layer is made of the following optical ink materials in the indicated mass fractions: 15-30% UV polyester acrylate, 25-40% UV modified epoxy acrylate, 10-23% spiropyran-containing compounds, 11-22% mixed solvent, 3-7% photoinitiator, 4-8% active amine, 0.4-1% leveling agent, 2-7% pigment, and 0.6-2.5% dispersant; The optical ink material preparation process includes the following steps: After heating the spiropyran group-containing compound to 50℃~70℃, UV-modified epoxy acrylate was added and premixed for 30min. After cooling to 35℃~45℃, UV polyester acrylate was added and mixed evenly to obtain the premix. The mixed solvent, dispersant, and pigment are mixed and ground into nano-powder fines with a particle size of 200-400 nm. The nano-powder fines are then added to the premix and stirred. After heating to 80-85°C, active amine and leveling agent are added sequentially and stirred for 20 min. After stirring, ultrasonic vibration is used to disperse for 10 min. The mixture is then cooled to 30-35°C and stored in the dark for 10-20 days to obtain the optical ink layer material.

2. The UV optical film material according to claim 1, characterized in that: The transparent adhesive layer is a UVOCA adhesive with a thickness of 50-150 μm; the substrate is a PET film substrate with a thickness of 100 μm-200 μm; the inner protective film layer and the outer protective film layer are made of PET material with thicknesses of 0.2 mm-1 mm, respectively.

3. The UV optical film material according to claim 1, characterized in that: The thickness of the frosted layer is 8μm to 20μm; the photoinitiator is TPO initiator or 1-hydroxycyclohexylphenyl ketone; and the UV monomer is one or more of the following: HHDA 1,6-hexanediol diacrylate with two functional groups, ACMO acryloylmorpholine with one functional group, and THFA tetrahydrofuran methyl acrylate with one functional group.

4. The UV optical film material according to claim 1, characterized in that: In step 11, filtration is performed in two stages using a 5-15 μm polypropylene filter cartridge, and the viscosity of the polyurethane acrylate is controlled at 15000-20000 mPa·s.

5. A UV optical film material according to claim 1, characterized in that: The UV optical transfer adhesive is made of the following materials in the indicated mass fractions: 15% UV polyester acrylate, 35% UV modified epoxy acrylate, 5% photoinitiator, 30% polyurethane acrylate, and 15% UV monomer; the thickness of the frosted layer is 12 μm.

6. A UV optical film material according to claim 1, characterized in that: The spiropyran-containing compound is one or more of undecenoyloxyspiropyran, N-hydroxyethylspiropyran acrylate, polyurethane containing dihydroxyspiropyran, and polyurethane containing spiropyran. The mixed solvent is composed of ethyl acetate, butyl acetate, and PMA propylene glycol monomethyl ether acetate. The photoinitiator is TPO initiator or 1-hydroxycyclohexylphenyl ketone. The active amine is N-methyldiethanolamine. The leveling agent is polyether-modified siloxane polymer or perfluorobutyl ethyl acrylate.

7. A method for manufacturing a UV optical film material according to any one of claims 1 to 6, characterized in that, The manufacturing method includes the following steps: The viscosity of the UV optical ink is controlled at 16"~18". The UV optical ink is placed in a nano-coating machine and coated on the outer surface of the substrate using a precision micro-concave ceramic coating roller. Then it is sent to a 10kw mercury lamp for UV curing to form an optical ink layer. A transparent adhesive layer is coated on the surface of the optical ink layer. After curing, a UV optical transfer adhesive is coated on the inner surface of the substrate to form a frosted layer. An inner protective film layer and an outer protective film layer are coated on the surface of the frosted layer and the surface of the transparent adhesive layer, respectively, and then dried to obtain a UV optical film material.

8. The method for manufacturing a UV optical film according to claim 7, characterized in that, UV optical ink is coated on the outer surface of the substrate using a micro-concave ceramic roller with 180-220 mesh and 45° diagonal grooves. The runout range of the micro-concave ceramic roller is ≤5μm. The coating temperature is controlled between 70℃ and 100℃.

9. A method for manufacturing a UV optical film according to claim 8, characterized in that, The coating temperature is controlled in three temperature zones: preheating zone 80±5℃, coating zone 85±3℃, and leveling zone 95±5℃. The coating speed is between 15 and 25 m / min.

10. The application of a UV optical film material according to any one of claims 1 to 6 in light diffusion films and electronic displays.

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