Near-infrared light shielding film material, preparation method and application
A technology of thin-film materials and near-infrared light, applied in optics, nonlinear optics, instruments, etc., can solve problems such as high cost, unfavorable industrialization, and hindering applications
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[0037] Utilize polymer to stabilize the polymer network of cholesteric liquid crystal itself as the method of diffusion carrier to prepare broadband reflective film, its specific preparation method is as follows figure 1 As shown, the steps include:
[0038]Step 1: Small molecule nematic liquid crystal, UV free radical polymerizable monomer, chiral compound, UV absorbing dye and free radical photoinitiator are mixed. A cholesteric liquid crystal composite system is obtained, and the operation process is protected from light.
[0039] In step 1, the mass fraction of the small molecule nematic liquid crystal is 65-90%, the mass fraction of the ultraviolet radical polymerizable monomer is 8-20%, the chiral compound is 0.6-10%, and the mass fraction of the ultraviolet-absorbing dye is 0.1-2% and the mass fraction of free radical photoinitiator is 0.1-1%.
[0040] Step 2: Small-molecule nematic liquid crystal, UV radical polymerizable monomer and free radical photoinitiator are m...
Embodiment 1
[0049] Preparation of the liquid crystal cell: dry the cleaned indium tin oxide glass in a drying oven at 50-60° C. for 2-3 hours for later use. First mix the silane coupling agent (KH-570) with water and methanol at a ratio of 5:1:94, then immerse and dry the spare glass while stirring and ultrasonically treat it for 10-15 minutes, then wash it with methanol for 2-3 times , blow off the excess ethanol with nitrogen, put it in a vacuum oven at 105°C and dry it for 1 hour to obtain lipophilic layered glass; fully mix the polytetrafluoroethylene solution and ethanol at a ratio of 1:2.5 and heat to 45°C, drop the resulting mixture On the spare glass substrate, use a glue coater to spin coat evenly at a speed of 1K rpm, and then put it in an oven at 150°C for 30 minutes. After taking it out, use a flannelette for parallel orientation treatment to obtain an oleophobic glass. A 20 μm thick PET film is placed between the oleophilic layer glass and the oleophobic layer glass as a spac...
Embodiment 2
[0064] The nematic liquid crystal SLC-1717, the UV polymerizable monomer C6M, the chiral compound R5011, the photoinitiator IRG651 and the UV-absorbing dye UV-327 were respectively 83.6%, 14%, 1.2%, 0.3% and 0.9%. Mass proportioning, mixing evenly, heating and dissolving, oscillating and ultrasonic treatment, pouring into the liquid crystal box of the first step.
[0065] The nematic liquid crystal SLC-1717, the ultraviolet light polymerizable monomer C6M and the photoinitiator IRG651 were mixed uniformly according to 89.5%, 10% and 0.5% respectively. Nematic liquid crystal.
[0066] After the system is stable, use ultraviolet light (0.5mW / cm 2 , 365nm) for 10 minutes, so that the polymerizable monomers are partially cured and cross-linked to form a gradient polymer network, and the oleophobic layer glass is peeled off. A 20 μm PET spacer is placed between the remaining part of the oleophobic layer glass and the orientation-treated glass to make a new liquid crystal cell wit...
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