Scientists from China conducted an experiment to analyze the effect of castor oil based chlorinated phosphate ester on thermal degradation of PVC. A novel flame retardant chlorinated phosphate ester based on castor oil (CPECO) was synthesized. Its chemical structure was characterised with FTIR and NMR.
Application of CPECO as a secondary plasticizer for PVC gained satisfied flame retardancy and substituted for dioctyl phthalate (DOP) partly. Increase in PVC blends was observed. The flame retardant mechanism showed that phosphorus containing generated from the pyrolysis of CPECO could promote char residual.