Abrasion resistance in the Tumble test of sol-gel hybrid coatings for ophthalmic plastic lenses

摘要

Hard abrasion-resistant coatings for ophthalmic plastics were obtained from mixtures of tetraethoxysilane, 3-metacrylo- xypropyltrimethoxysilane and methyl methacrylate, and were cured at 120deg.C and 140deg.C for different times. The Tumble test was used to measure the abrasion resistance of these coated plastics. This abrasion resistance was strongly dependent on the curing time and temperature. The infrared analysis of the curing processes showed that, in order to achieve the highest abrasion resistance, these acrylic hybrid coatings must be fully polymerized, but overcuring must be carefully avoided. Finally, a linear correlation was found between the abrasion resistance of these coated samples (as measured by the Tumble Test) and their microhardness.