Multilayer NIR reflective coatings on transparent plastic substrates from photopolymerizable nanoparticulate sols

A new synthesis and processing route for preparing multilayer interference coatings on plastic substrates has been developed. For this purpose, alcoholic sols of surface modified (3-glycidoxypropyltrimethoxysilane, GPTS) SiO sub(2) and TiO sub(2) particles with sizes of 10 and 4 nm, respectively, were synthesized. Layers were prepared by dip coating, subsequent UV curing (2.1 J/cm super(2)) and thermal post treatment at 80 degree C for 15 min. Refractive indices of n sub(D) identical with 1.47 for SiO sub(2) layers and n sub(D) identical with 1.93 for TiO sub(2) were measured. As an example, plastic sheets were coated by angle dependent dip coating with withdrawal speeds from 3 up to 6 mm/s and an inclination angle of 4 degree . By this way, one side of the substrate was coated with six quarterwave thick layers (peak wavelength at 750 nm), producing a reflective interference filter with a reflectivity of 72% between 650 and 900 nm. On the other side of the substrate, an interference filter with a reflectivity of 66% between 800 and 1100 nm was produced simultaneously. The interference coatings do not show delamination or defects after boiling water test (H sub(2)O + 5 wt.% NaCl, 8 h) and excellent adhesion (GT 0, TT 1) was obtained in the cross cut tape test. Yellowing did not occur ( Delta g < 3) and the mechanical properties of the interference filters were not altered after dry sun test at 760 W/m super(2) for 270 h. For mechanical protection a nanocomposite hardcoat can be applied on top of the NIR reflectance filters without changing the optical properties remarkably.