Abstract
An efficient coating method combined with a bulk addition mode was designed and applied to prepare flame retardant thermoplastic polyolefin (TPO) sheets. This route can effectively overcome the negative influence of high loading flame retardants on the mechanical properties and processability of the materials. The coating (thickness: 120 μm) with intumescent flame retardants and TPO (film-forming resin) involved, can endow the TPO sheet (only 13.06% intumescent flame retardants in the sheet) V-0 rating at UL-94 test (1.6 mm), and 30.5% of Limiting Oxygen Index (LOI), as well as greatly decreased heat release rate evaluated by cone calorimeter. Compared with traditional bulk flame retardant mode, the flame retardant TPO sheets prepared by the above method possessed much higher flexibility due to lower loading when achieving the similar flame retardance (36% flame retardants loading to achieve V0 rating for traditional bulk addition mode). As the results of better comprehensive properties, this method combining coating with a bulk addition mode, shows a promising prospect in future application.
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