Development of Nonflammable Coating for Polycarbonate.
Abstract
Sodium and potassium silicates were applied by drawing and dipping techniques to polycarbonate to provide a nonflammable coating. A polyurethane coating between the silicate and the substrate was required to achieve good adhesion. Polymeric films, usually polyurethane or polystyrene, were applied over the silicate to improve the long-time stability of the coating system. A limited number of organic-modified silica coatings were prepared but were significantly less effective than the alkali-silicate coatings in preventing flame damage to polycarbonate. Experimental glass compositions were formulated for plasma spraying studies from the alkali-B2O3-SiO2, soda-lime-silica, and BaO-A12O3-B2O3 systems. Commercial glasses were also employed. All plasma-sprayed coatings were too translucent to satisfy optical requirements in the intended application. Optically transparent pyrex coatings were applied to polycarbonate by RF sputtering, but substrate discoloration was observed in most cases. Most of the coatings prepared in the program were evaluated for flame resistance, light transmittance, optical uniformity and distortion, humidity and resistance, vacuum and ultraviolet stability, and flexural and impact strength.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1969
- Accession Number
- ADA309662
Entities
People
- C. E. Semier
- M. C. Willson
Organizations
- Monsanto