	US 11,747,522 B1
	Twill optical film capable of realizing 3D effect of naked eye of display screen and preparation method thereof
Zhihui Li, Yancheng (CN); Yong Sun, Yancheng (CN); and Meiming Xiao, Yancheng (CN)
Assigned to People Baiye Technology Co., LTD., Yancheng (CN)
Filed by People Baiye Technology Co., LTD., Yancheng (CN)
Filed on Mar. 2, 2023, as Appl. No. 18/177,119.
Application 18/177,119 is a continuation of application No. PCT/CN2022/142193, filed on Dec. 27, 2022.
Claims priority of application No. 202210559700.9 (CN), filed on May 23, 2022.
Int. Cl. G02B 3/00 (2006.01); G02B 1/04 (2006.01); G02B 30/27 (2020.01)

CPC G02B 3/0031 (2013.01) [G02B 1/041 (2013.01); G02B 30/27 (2020.01)]

6 Claims

1. A preparation method of a twill optical film capable of realizing a 3D effect of a naked eye of a display screen, comprising the steps of:

step 1: coating a grating coating on one side of a transparent base film using a micro-nano imprint technique, and curing the transparent base film by ultraviolet to form a uniformly arranged columnar lens array; and obtaining a twill grating layer;

step 2: coating a filling coating on the twill grating layer and curing the twill grating layer by ultraviolet; placing the twill grating layer in an oven in an atmosphere with a relative humidity of 95-98% controlled by a saturated solution of ammonium dihydrogen phosphate;

setting the temperature to 100-120° C., and thermally cross-linking the twill grating layer for 3-4 hours; and obtaining a twill optical film;

wherein the raw material of the grating coating comprises the following components: by weight, 50-65 parts of an acrylic resin with a high refractive index, 20-25 parts of a bisphenol fluorenyl acrylate, 5-7 parts of a modified titanium oxide, 12-18 parts of pentaerythritol tetrakis (3-mercaptopropionate), and 1-2 parts of a photoinitiator; and the acrylic resin with a high refractive index has a refractive index of 1.61 to 1.63;

the raw materials of the filling coating include the following components: by weight, 35-40 parts of an acrylic resin with a low refractive index, 40-45 parts of a perfluorinated acrylic monomer, 8-10 parts of an allyl glycidyl ether, 2-3 parts of tetra-n-propoxyzirconium, 1.2-2.5 parts of a photoinitiator, and 0.5-0.8 parts of tertiary amine; the acrylic resin with a low refractive index has a refractive index of 1.40 to 1.42; the preparation method of the modified titanium oxide comprises: ultrasonically dispersing nano titanium oxide in a toluene solution, adding toluene diisocyanate and 2/3 amount of dibutyl tin dichloride, and setting the temperature to 50-60° C. to react for 4-5 hours; adding 2-hydroxy acrylate and ⅓ amount of dibutyl tin dichloride, continuing the reaction for 2-3 hours, filtering, washing and drying to obtain a modified titanium oxide;

wherein the dibutyltin dichloride is added in an amount of 0.12 to 0.15wt% based on the total mass of toluene diisocyanate and 2-hydroxy acrylate;

wherein in step 1, in the micro-nano imprint technique, the imprinting speed is 20-30 m/h and the pressure is 0.1-0.15 Mpa; in the process of curing by ultraviolet, the power is 60-100 W/cm², the energy is 800-900 mj/cm², and the curing time is 2-3 seconds.