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Abstract

Effects of four flame retardant additives, (1) antimony trioxide, (2) zinc borate, (3) chlorinated paraffin wax and (4) decabromodiphenyl ether in a PVC-epoxidised natural rubber miscible composition in the presence of a phthalate plasticizer and a phosphate plasticizer were studied. Mixing was done in a Brabender plasticorder at 180 °C. Incorporation of additives did not affect the miscibility of the blend components, and the strength property re tained between 83% and 91%. The processibility of the blend was improved due to chlorinated paraffin wax and slightly impaired due to zinc borate. Antimony trioxide and decabromodiphenyl ether had little influence on the processibility. The flame retardant additives were more effective in a phthalate plasticizer medium than in a phosphate plasticizer medium. The thermal stability of com ponents was mutually influenced by the additive and the matrix. The vapor phase flame inhibiting action of antimony trioxide in PVC compositions was more pronounced in a phthalate plasticizer medium than in a phosphate plas ticizer medium. Phosphate plasticizer in general induced a condensed phase mechanism in the presence of a flame retardant additive.

Keywords

poly(vinyl chloride)epoxidised natural rubber halogenated flame retardants non-halogen flame retardants flammability flame retarda tion.

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Flame Retardant Effects in PVC-Epoxidised Natural Rubber Miscible Blends: Halogen and Non-Halogen Based Additives

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