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
Recommended Citation
Li, B., Zhan, Z., Zhang, H., & Sun, C. (2014). Flame retardancy and thermal performance of polypropylene treated with the intumescent flame retardant, piperazine spirocyclic phosphoramidate. Journal of Vinyl and Additive Technology, 20 (1), 10-15. https://doi.org/10.1002/vnl.21337