Synthesis of zinc hydroxystannate microcapsule for improving flame retardancy and smoke suppression of poly(lactic acid)

摘要

In this paper, zinc hydroxystannate (ZHS) was microencapsulated by aluminium phosphate (AlP) to prepare AlP/ZHS microcapsule, it was introduced into polylactic acid (PLA). The flammability of the PLA was characterized by limiting oxygen index (LOI), vertical burning (UL-94), smoke density (SDR) and cone calorimeter test. The results showed that PLA containing 15 wt% AlP/ZHS microcapsule achieved the LOI value of 32.5%, passed the UL-94 V-0 rating, and significantly decreased the peak heat release rate, which imply that the fire safety of PLA has been improved. Meanwhile, the SDR value reached 44%. Thus, AlP/ZHS microcapsule can effectively enhance flame retardancy and smoke suppression, showing potential applications as multifunctional advanced composites. (C) 2017 Elsevier B.V. All rights reserved.