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Advances in Materials Science and Engineering
Volume 2013 (2013), Article ID 960914, 8 pages
http://dx.doi.org/10.1155/2013/960914
Research Article

Synergistic Flame Retardancy of Aluminium Dipropylphosphinate and Melamine in Polyamide 6

College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China

Received 21 May 2013; Accepted 24 September 2013

Academic Editor: William A. Jesser

Copyright © 2013 Linsheng Tang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The synergistic flame retardancy of aluminium dipropylphosphinate (ADPP) and melamine (ME) in polyamide 6 (PA6) was studied by the limiting oxygen index (LOI) measurement, the vertical burning test, and the cone calorimeter test, and the mechanism was also discussed by thermogravimetric and residual analyses. The experimental results indicated that there was obvious synergistic flame retardancy between ADPP and ME under their appropriate weight ratios. The thermogravimetric results and the analysis of the residues obtained in cone calorimeter test showed that ADPP and ADPP/ME played the role of flame retardance by gaseous- and condensed-phase mechanisms, where, on one hand, they were decomposed into nonvolatile aluminum phosphate and promoted the carbonization of PA6, and the formed intumescent layer resulted in flame retardancy by the barrier effect on heat, air, and decomposition products, and on the other hand, they were decomposed into volatile phosphorus compounds which bring about flame retardancy by flame inhibition. Using a combination of ADPP and ME improved charring of PA6 and raised the residual rate of P and Al, thus, improving the barrier effect in the condensed phase.