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CN-122018050-A - Anti-dazzle film and preparation method and application thereof

CN122018050ACN 122018050 ACN122018050 ACN 122018050ACN-122018050-A

Abstract

The invention belongs to the technical field of optical films and relates to an anti-dazzle film and a preparation method and application thereof, wherein the anti-dazzle film comprises a polyester substrate and an anti-dazzle layer arranged on one side surface of the polyester substrate, the thickness of the polyester substrate is less than or equal to 45 mu m, the in-plane retardation value R0 is less than or equal to 75 nm, the thickness-direction retardation value Rth is more than or equal to 5000 nm, the surface of the anti-dazzle layer is provided with a concave-convex structure, in the surface roughness test of the anti-dazzle layer with the concave-convex structure, the average curvature Spc of a peak point algorithm is 50-150 mm ‑1 , the average length Rsm of profile curve elements is 15-60 mu m, and the obtained anti-dazzle film has good performance and the advantages of no rainbow mark and light and thin anti-dazzle by limiting the structures of the polyester substrate and the anti-dazzle layer on the premise of not depending on the rising retardation parameters of the thickening polyester substrate.

Inventors

  • Gai Beibei
  • ZHANG XUE
  • WANG LEI

Assignees

  • 合肥高美光电材料有限公司

Dates

Publication Date
20260512
Application Date
20260312

Claims (10)

  1. 1. An antiglare film, characterized in that the antiglare film comprises a polyester substrate and an antiglare layer provided on one side surface of the polyester substrate; The thickness of the polyester substrate is less than or equal to 45 mu m, the in-plane retardation value R0 is less than or equal to 75 nm, and the thickness direction retardation value Rth is more than or equal to 5000 nm; The surface of the anti-dazzle layer is provided with a concave-convex structure, and in the surface roughness test of the anti-dazzle layer with the concave-convex structure, the average curvature Spc of peak top point calculation is 50-150 mm -1 , and the average length Rsm of profile curve elements is 15-60 mu m.
  2. 2. The antiglare film according to claim 1, wherein the polyester substrate comprises a polyethylene terephthalate substrate.
  3. 3. The antiglare film according to claim 1 or 2, wherein the antiglare layer has a thickness of 4 to 6 μm.
  4. 4. The antiglare film according to any one of claims 1 to 3, wherein the material of the antiglare layer comprises a binder resin, modified acicular inorganic particles, and organic particles; preferably, the material of the antiglare layer comprises the following components in parts by weight: 75-95 parts of binder resin; 3-5 parts by weight of modified needle-shaped inorganic particles; 8-12 parts of organic particles.
  5. 5. The antiglare film according to claim 4, wherein the modified acicular inorganic particles are produced by a process comprising the steps of: (A1) Reacting the unmodified needle-shaped inorganic particles with an aminosilane coupling agent to obtain amino modified needle-shaped inorganic particles; (A2) Reacting the amino modified needle-like inorganic particles obtained in the step (A1) with glycidyl methacrylate to obtain the modified needle-like inorganic particles; Preferably, the unmodified needle-like inorganic particles of step (A1) comprise unmodified wollastonite; preferably, the aminosilane coupling agent of step (A1) comprises any one or a combination of at least two of gamma-aminopropyl triethoxysilane, 3-aminopropyl trimethoxysilane or 3-aminopropyl methyldiethoxysilane; Preferably, the mass ratio of the unmodified needle-like inorganic particles to the aminosilane coupling agent in the step (A1) is (5-20): 1; preferably, the reaction of step (A1) is carried out in a mixed solvent of ethanol and water; preferably, the volume ratio of the ethanol to the ethanol is (9-12): 1; Preferably, the temperature of the reaction in the step (A1) is 60-70 ℃ and the time is 2-3 hours; preferably, the mass ratio of the amino modified needle-shaped inorganic particles to the glycidyl methacrylate in the step (A2) is (5-20) 1; Preferably, the reaction of step (A2) is carried out under nitrogen protection; Preferably, the temperature of the reaction in the step (A2) is 70-80 ℃ and the time is 5-7 h.
  6. 6. The antiglare film according to claim 4 or 5, wherein the organic particles comprise a methyl methacrylate-styrene copolymer; preferably, the binder resin includes urethane acrylate and multifunctional acrylate.
  7. 7. The method for producing an antiglare film according to any one of claims 1 to 6, wherein the antiglare film is obtained by applying a coating liquid of an antiglare layer to one side surface of a polyester substrate and curing the coating liquid.
  8. 8. The method of claim 7, wherein the method of coating is roll coating; preferably, the curing process is a UV curing process.
  9. 9. A polarizing plate, wherein the polarizer comprises the antiglare film according to any one of claims 1 to 6.
  10. 10. A display device comprising the antiglare film according to any one of claims 1 to 6.

Description

Anti-dazzle film and preparation method and application thereof Technical Field The invention belongs to the technical field of optical films, and relates to an anti-dazzle film, a preparation method and application thereof. Background Polyester films are an important choice for base films in the photovoltaic field by virtue of their excellent optical transparency, mechanical strength, heat resistance and electrical stability. Polyester film used in photoelectric field is usually coated with functional layer on the surface with polyester film as base film to reach antiglare, antireflection, friction-resistant performance. At present, when an anti-dazzle layer is coated on the surface of a polyester film to be used as an anti-dazzle film, the anti-dazzle film is easy to generate the phenomenon of reflected light interference, namely rainbow lines, due to factors such as stretching process difference of the polyester film, film thickness and coating thickness difference, coating component deviation, unmatched refractive index and the like, and the perspective and visual effect of a product can be influenced. The prior art CN103376479a discloses an antiglare film, a polarizing plate and an image display device, which suppress rainbow spots of a display image by selecting a polyester substrate having a specific retardation value (not less than 3000 nm) in combination with the distribution of particles in the antiglare layer, but the invention relies on a high thickness (about 100 μm) of the substrate, failing to meet the demand for light and thin modern display devices. Accordingly, in order to solve the above-mentioned problems, there is an urgent need for development of an antiglare film which is thin and lightweight, can suppress rainbow lines, and has excellent antiglare properties. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide an anti-dazzle film, a preparation method and application thereof, wherein the anti-dazzle film has good anti-dazzle performance without rainbow patterns on the premise of inhibiting rainbow patterns without depending on the rising delay parameters of a thickening polyester substrate, and has the advantage of light and thin weight. In order to achieve the aim of the invention, the invention adopts the following technical scheme: In a first aspect, the present invention provides an antiglare film comprising a polyester substrate and an antiglare layer disposed on a side surface of the polyester substrate; The polyester substrate has a thickness of 45 [ mu ] m or less (for example, 44 [ mu ] m, 43 [ mu ] m, 42 [ mu ] m, 41 [ mu ] m, 40 [ mu ] m, 39 [ mu ] m, 38 [ mu ] m, 37 [ mu ] m, 36 [ mu ] m, 35 [ mu ] m, etc.), an in-plane retardation value R0 of 75 nm or less (for example, 74 nm, 73 nm, 72 nm, 71 nm, 70 nm, 69 nm, 68 nm, 67 nm, 66 nm, 65 nm, 60 nm, 55 nm, etc.), and a thickness direction retardation value Rth of 5000 nm or more (for example, 5000 nm、5200 nm、5400 nm、5600 nm、5800 nm、6000 nm、6500 nm、7000 nm、7500 nm、8000 nm、8500 nm、9000 nm、9500 nm, 10000 nm, etc.); The antiglare layer has a surface with a concave-convex structure, and in the surface roughness test of the antiglare layer having a concave-convex structure, the peak top point arithmetic mean curvature Spc is 50 to 150 mm -1 (for example 50 mm-1、60 mm-1、70 mm-1、80 mm-1、90 mm-1、100 mm-1、110 mm-1、120 mm-1、130 mm-1、140 mm-1 or 150 mm -1, etc.), and the mean length Rsm of the contour curve element is 15 to 60 [ mu ] m (for example 15 [ mu ] m, 20 [ mu ] m, 25 [ mu ] m, 30 [ mu ] m, 35 [ mu ] m, 40 [ mu ] m, 45 [ mu ] m, 50 [ mu ] m, 55 [ mu ] m, 60 [ mu ] m, etc.). On the one hand, the invention limits the thickness of the polyester substrate to be less than or equal to 45 mu m, can ensure that the obtained anti-dazzle film has the characteristics of light and thin, can meet the light and thin requirements of modern display devices, and simultaneously limits the in-plane retardation value R0 of the polyester substrate to be less than or equal to 75 nm and the thickness direction retardation value Rth to be more than or equal to 5000 nm, under the condition, the polyester substrate only shows slight rainbow, but not serious rainbow, in rainbow test, because when natural light passes through the polyester substrate at extinction positions between orthogonal polaroids, the light intensity Isin2(R/) Wherein R is a delay value,Is the wavelength of light whenWhen the light intensity I is in the visible light wavelength (380-780 nm) range, the light intensity I fluctuates along with the delay value of the polyester substrate, and sin 2 is at different delay valuesR/) As shown in FIG. 1, it can be seen from FIG. 1 that sin 2 @ when the in-plane retardation value R0 of the polyester substrate is not more than 75 nmR/) Curve atThe fluctuation in the range of 380-780 nm is small, and the transmitted light in red, green and blue wave bands is almost uniform, so that only slight ra