IMPROVEMENT OF FLAME RETARDANCY OF NANOSILICA COATED POLYURETHANE USING SODIUM SILICATE AS SILICA SOURCE

Abstract

The paper reports the synthesis of silica sol by ion exchange method using
sodium silicate as silica source. Nano silica particles are deposited on polyurethane
surface by the deep coating method. Nano silica coated polyurethane are
characterized by XRD, FTIR, SEM, EDX and TG-DTA. Flame retardance properties of
the materials are determined by UL-94 method and the limiting oxygen impact
resistance strength and compressive are examined and evaluated. From the
obtained results, it revealed that flame retardancy of the materials is improved, LOI
value increased from 19% to 31% and and the mechanical properties like tensile
strength, impact resistance strength are improved