Flame retardancy and thermal performance of polypropylene treated with the intumescent flame retardant, piperazine spirocyclic phosphoramidate

Document Type

Article

Publication Date

3-1-2014

Abstract

Piperazine spirocyclic phosphoramidate (PSP), a novel halogen-free intumescent flame retardant, was synthesized and used to improve the flame retardancy and dripping resistance of polypropylene (PP) combined with ammonium polyphosphate (APP) and a triazine polymer charring-foaming agent (CFA). The optimum flame-retardant formulation was PSP:APP:CFA = 3:6:2 (weight ratio). The flammability and thermal behavior of the (intumescent flame-retardant)-PP (IFR-PP) were investigated via limiting oxygen index (LOI), vertical burning tests (UL-94), thermogravimetric analysis, and cone calorimetry (CONE). The results indicated that the IFR-PP had both excellent flame retardancy and anti-dripping ability. The optimum flame-retardant formulation gave an LOI value of 39.8 and a UL-94 V-0 rating to PP. Moreover, both the heat release rate and the total heat release of the IFR-PP with the optimum formulation decreased significantly relative to those of pure PP, according to the cone calorimeter analyses. The residues of IFR-PP obtained after CONE tests were observed by scanning electron microscopy, and it was found that the char yield was directly related to the flame retardancy and anti-dripping behavior of the treated PP. J. VINYL ADDIT. TECHNOL., 20:10-15, 2014. © 2014 Society of Plastics Engineers © 2014 Society of Plastics Engineers.

Publication Source (Journal or Book title)

Journal of Vinyl and Additive Technology

First Page

10

Last Page

15

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