COATING COMPOSITION FOR FORMING SCRATCH RESISTANT SILICA THIN LAYERS CONTAINING SILICA NANO-PARTICLES OF DIFFERENT SIZES, METHOD OF PREPARING THE SAME

摘要

PURPOSE: A coating composition is provided to form a dense silica protection film without defects by using nano particles with different sizes, and to be sintered at temperature of 200 C or less. CONSTITUTION: A coating composition comprises 85-90 weight% of surface treatment liquid comprising a silica precursor mixture which consists of tetraethoxysilane and methyltriethoxysilane, and 10-15 weight% of a silica nanoparticle mixture which consists of primary silica nanoparticles with the particle diameter of 4-18 nm and secondary nanoparticles with the particle diameter of 45-55 nm. The surface treatment liquid consists of 1-3 M of silica precursor mixture consisting of tetraetoxysilane and methyltriethoxysilane, 5-15 M of water, 0.01-0.1 M of acid catalyst, and 5-15 M of solvent.