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CN-121975175-A - Flexible anti-glare film with superhydrophobic surface and preparation method and application thereof

CN121975175ACN 121975175 ACN121975175 ACN 121975175ACN-121975175-A

Abstract

The invention relates to the technical field of anti-dazzle films, in particular to a flexible anti-dazzle film with a super-hydrophobic surface, a preparation method and application thereof. The flexible anti-glare composite film prepared by the invention has the advantages that the light transmittance can reach 92.1%, the haze can reach 93.3%, the film is far beyond the commercial anti-glare film in the prior art, and meanwhile, the film has super-hydrophobicity, a water contact angle of 165 degrees and a sliding angle of 1.2 degrees, and the film has self-cleaning and anti-fog functions.

Inventors

  • GAO HUAIZHI
  • BAI SHAOJUN
  • LIAO CHENGCHENG
  • Zhou Kuiren

Assignees

  • 苏州世华新材料科技股份有限公司

Dates

Publication Date
20260505
Application Date
20251231

Claims (13)

  1. 1. A flexible anti-glare composite film with a superhydrophobic surface is characterized by comprising a PET matrix, wherein PU nanofibers forming a network are embedded in the PET matrix, a fluorinated titanium dioxide nanoparticle coating is arranged on the surface of the PET matrix, The average diameter of the PU nanofiber is 500-800 nm; The average particle size of the fluorinated titanium dioxide nano particles is 100-300 nm; The optical transmittance of the obtained composite film is more than 90%, the haze is more than 90%, the water contact angle is more than 165 degrees, and the sliding angle is less than 1.1 degrees.
  2. 2. The flexible anti-glare composite film with a superhydrophobic surface according to claim 1, wherein the average diameter of the PU nanofibers is 780nm, and the average particle diameter of the fluorinated titanium dioxide nanoparticles is 200nm.
  3. 3. The flexible anti-glare composite film with the superhydrophobic surface according to claim 1, wherein the PU nanofiber is matched with the PET substrate in refractive index, the PU nanofiber is 1.51 in refractive index, the PET substrate is 1.57 in refractive index, and the mass concentration of the PU nanofiber is 10-20wt%.
  4. 4. The flexible anti-glare composite film with a superhydrophobic surface of claim 3, wherein the mass concentration of the PU nanofiber is 15wt%.
  5. 5. The flexible anti-glare composite film with the superhydrophobic surface of claim 1, wherein the fluorinated titanium dioxide nanoparticles are prepared by taking (NH 4 ) 2 TiOF 4 as a raw material, obtaining a metatitanic acid precipitate in ammonia water, adding zinc oxide as a crystal form promoter, and performing two-stage calcination to obtain the nano fluorinated titanium dioxide powder.
  6. 6. A method for preparing a flexible anti-glare film with a superhydrophobic surface, which is characterized by comprising the following steps of: (a) Preparing an ethyl acetate solution containing PU with the concentration of 10-20wt%, and F-TiO 2 nano-particle solvent; (b) Applying an uncured PET coating to a PET substrate; (c) Depositing the ethyl acetate solution containing PU in the step (a) on the uncured PET coating in an electrostatic spinning mode to form a PU nanofiber network; (d) Heating and curing the PET coating to form a composite film with PU nanofibers embedded in a PET matrix, namely a PET-PU film; (e) Etching the micron-sized pits by using a laser matrix; (f) Depositing the F-TiO 2 nano-particles on the surface of the PET-PU film in a solvent bath; (g) And (5) drying to obtain the flexible anti-glare composite film.
  7. 7. The method for preparing a flexible anti-glare film having a superhydrophobic surface according to claim 6, wherein the concentration of the PU-containing ethyl acetate solution is 15 wt%; In the step (c), the condition of electrostatic spinning is that the voltage is 5-15 kV, the propelling speed is 0.8-1.2 mL/h, and the distance between the needle head and the collector is 15-25 cm.
  8. 8. The method for preparing a flexible anti-glare film with a superhydrophobic surface according to claim 7, wherein the electrospinning condition is a voltage of 10 kV, a pushing speed of 1.0 mL/h, and a distance between a needle and a collector of 20 cm.
  9. 9. The method for preparing a flexible anti-glare film with a superhydrophobic surface according to claim 6, wherein in the step (d), the heating and curing conditions are that the temperature is 80-100 ℃ and the duration is 1-2.5 hours.
  10. 10. The method for preparing a flexible anti-glare film having a superhydrophobic surface according to claim 9, wherein the heating and curing conditions are a temperature of 90 ℃ for a duration of 1.5 hours.
  11. 11. The method for preparing a flexible anti-glare film having a superhydrophobic surface according to claim 6, wherein in the step (F), the F-TiO 2 nanoparticle solvent is prepared by: F-TiO 2 , acetone and deionized water are mixed according to the mass ratio of 0.2 g to 100 mu L to 400 mu L, and ultrasonic treatment is carried out for 20-40 min.
  12. 12. An optical conditioning method, characterized in that the flexible anti-glare composite film with super-hydrophobic surface according to any one of claims 1 to 5 is adopted to realize the optical conditioning method through a three-mode light scattering mechanism, wherein the three-mode light scattering comprises: mie scattering, namely, initiating by PU fibers dissolved on the surface of the composite film; micropore reflection is initiated by micron-sized pits etched by laser; rayleigh scattering is induced by the F-TiO 2 nanoparticle coating.
  13. 13. An optical device characterized in that the flexible anti-glare composite film having a superhydrophobic surface according to any one of claims 1-5 is applied, and the composite film is capable of reducing the illuminance of a laser light source from 120000 Lux to 300 Lux or less and reducing the color temperature variation range from 3301K to 905K.

Description

Flexible anti-glare film with superhydrophobic surface and preparation method and application thereof Technical Field The invention relates to the technical field of anti-dazzle films, in particular to a flexible anti-dazzle film with a super-hydrophobic surface, a preparation method and application thereof. Background The glare pollution refers to the visual pollution phenomenon generated when the brightness of a light source is too high or the brightness difference between the background and the center of the visual field is large, and is common to scenes ‌ such as automobile high beam lamps, glass curtain wall light reflection, excessively illuminated billboards and the like. The key feature is that excessive or inappropriate light enters the human eye, which negatively affects the physiological, psychological and living environment ‌. With the development of urban modernization and night illumination, glare pollution has become a non-negligible environmental problem. Glare is classified into direct glare (e.g., high brightness light sources) and indirect glare (e.g., reflected light), and long-term exposure can lead to visual fatigue, eye pain, and even temporary blindness. An anti-dazzle electrostatic spinning composite nanofiber membrane and a preparation method thereof are disclosed in China patent with a publication number of CN116240730B, wherein the anti-dazzle electrostatic spinning composite nanofiber membrane is used for solving the problem of glare pollution in the prior art, and comprises the following steps of placing nano particles with diameters of 200-600 nm in an organic solvent system 1, uniformly dispersing the nano particles through ultrasonic and stirring, placing a spinnability high polymer material in an organic solvent system 2, preparing spinnability high polymer solutions with different concentrations, and uniformly mixing the two solutions according to different proportions to obtain spinning precursor liquid; step 02, using a rotary cross fork as a receiving device to carry out electrostatic spinning on the spinning precursor liquid to obtain an electrostatic spinning fiber membrane, and step 03, carrying out dip coating on the electrostatic spinning fiber membrane by using resin with high light transmittance to obtain the composite nanofiber membrane. The composite nanofiber membrane prepared by the invention has certain haze and good transparency, and can effectively generate light scattering effect on two opposite sides in the light propagation process, thereby playing an anti-glare role. However, the difference in refractive index between the fiber and air is large, resulting in low light transmittance (typically < 85%). Other anti-glare technologies such as anti-glare glass, coating and ultrathin film also have the problems that the haze is increased, the light transmittance is obviously reduced, the preparation cost of nano imprinting, laser etching and other processes is high, the stability of a biological template is poor, nano particles are easy to agglomerate, the optical performance is uneven and the like. In order to solve the problems, the invention provides a flexible anti-glare film with a superhydrophobic surface, and a preparation method and application thereof. Disclosure of Invention The invention aims to provide a flexible anti-glare film with a superhydrophobic surface, and a preparation method and application thereof, so as to solve the problems in the background art. In order to solve the technical problems, the invention provides a flexible anti-glare composite film with a super-hydrophobic surface, which comprises a PET (polyethylene terephthalate) matrix, wherein PU (polyurethane) nanofibers forming a network are embedded in the PET matrix, a fluorinated titanium dioxide nanoparticle coating is arranged on the surface of the PET matrix, The average diameter of the PU nanofiber is 500-800 nm; the average particle size of the fluorinated titanium dioxide nano particles is 100-300 nm; the optical transmittance of the obtained composite film is more than 90%, the haze is more than 90%, the water contact angle is more than 165 degrees, and the sliding angle is less than 1.1 degrees. The key components for achieving high light transmittance are PU nanofiber and PET substrate, and the influence mechanism is an index matching principle that the PU refractive index (1.52) is close to that of PET (1.57), so that light reflection and scattering loss between fiber-substrate interfaces are remarkably reduced, and light can pass through the composite material more smoothly. The key components for achieving high haze are PU nanofiber and F-TiO 2, the influencing mechanism is a multimode light scattering mechanism, namely a Mie scattering mechanism, namely PU fiber diameter (about 1 μm) is similar to visible light wavelength scale, incident light is strongly scattered forwards, b Rayleigh scattering is that F-TiO 2 nano particles (about 200 nm) cause isotropic scatte