Application of Nanometer Antimony Trioxide Modified by Dioctyl Phthalate in Polyvinyl Chloride Flame Retardant Materials

Abstract

In order to improve the compatibility and dispersion of antimony trioxide nanoparticles (nano-Sb2O3) in polyvinyl chloride (PVC) and improve the comprehensive properties of PVC, a novel type of nano-Sb2O3/DOP/PVC composites was prepared by using nano-Sb2O3 modified by dioctyl phthalate (DOP) as flame retardant and the mechanical properties and flame-retardant properties of the composites were studied. The results indicated that nano-Sb2O3 particles modified by appropriate DOP could improve the flame retardancy and tensile strength of PVC matrix composites due to good dispersibility and interface compatibility of nano-Sb2O3 in PVC matrix. The PVC matrix composites containing 2 wt% nano-Sb2O3 particles modified by DOP with 5 wt% of usage had excellent flame retardancy, which LOI was 29.8% and its UL94 grade was V-0 level. And the heat release rate,smoke production rate, CO content and CO2 content of the composites was significantly reduced. Meanwhile, the tensile strength and Young's modulus of the composites were 15.9 MPa and 2.1 GPa, respectively.

Keywords

• polyvinyl chloride
• antimony trioxide nanoparticles
• dioctyl phthalate
• composites
• flame retardancy
• mechanical properties