Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8044222 | Vacuum | 2018 | 26 Pages |
Abstract
In this present study, anti-scratch and anti-algal coating formulations were developed with silica and silica-titania core-shell nanoparticles individually in polyurethane binder. This core-shell nanoparticle was synthesized in house to utilize the mechanical property of core silica and photo-catalytic activity of thin titania shell on silica core. High mechanical property of silica improves the strength and anti-scratch property of polyurethane film whereas photo-catalytic activity of titania provides anti-algal property of the film. Silica nanoparticles were prepared through sol-gel process. TiO2 nanoparticles and core-shell nanoparticles were prepared through peptization process. The prepared nanoparticles - silica, titania and silica-titania core-shell nanoparticles were characterized by Dynamic light scattering, UV-visible spectrophotometer, scanning electron microscopy, FTIR and X-Ray Diffraction. Polyurethane coating formulations were developed with polyurethane binder, thinner and above prepared nanoparticles, where percentage of nanoparticles were kept at 4â¯wt% of total formulation. Dry films were casted on glass substrate with these coating formulations after applying with brush and heated at 100â¯Â°C. Scratch testing were carried out for these dried films with dry film thickness of 100â¯Î¼m on glass substrate at different load from 3N to 9N. The same coating formulations were applied on small pieces of bricks for anti-algal testing against green algae and mixed algae. This core-shell formulation successfully improved the scratch resistance of coatings up-to 5N load and also provided good anti-algal property.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Jaya Verma, Subhasha Nigam, Surbhi Sinha, Arpita Bhattacharya,