Synergistic effects of silicone resin on an aluminium diethylphosphinate flame retardant polyamide 6,6 system

Document Type

Article

Publication Date

1-1-2015

Abstract

Silicone resin has been used as a synergistic agent for the preparation of aluminum diethylphosphinate (AlPi) flame retardant polyamide 66 (PA66/AlPi) and PA66/AlPi/silicone resin composites through twin-screw extrusion. The limiting oxygen index (LOI), used to characterize the minimum amount of oxygen needed to flame, demonstrated that the PA66/9.7%AlPi/0.3% silicone resin exhibited an excellent flame retardant efficiency with a high LOI value of 32.3%. However, when silicone resin incorporated into the AlPi/PA66 composites and the total loading amount of AlPi/silicone resin (3 wt% based on flame retardant) mixture is only 10 wt%, the samples with the thickness of 3.2 mm can successfully pass UL-94 V-0 flammability rating. Cone calorimeter test revealed that the heat release rate (HRR) and total heat rate (THR) for PA66/9.7%AlPi/0.3% silicone resin composites have a significantly decreased rate by 44.8 and 14.8% compared with these of pure PA66, respectively. Thermal gravimetric analysis (TGA) showed that the PA66/9.7%AlPi/0.3% silicone resin composites had vast chars of 19.3% even at 800 C, enhanced the thermal stability of the PA66/AlPi systems at high temperature and promoted the char residue formation. Scanning electron microscopy (SEM) indicates a solid and tough residue of the burned PA66/9.7%AlPi/0.3% silicone resin composites as compared with very loose and brickle residue of the burned pure PA66, indicating that a suitable amount of silicone resin played a synergistic effect in the flame retardancy. The analysis of XPS indicates that silicone resin promoted the formation of sufficient char on the materials surface and improved the flame retardant properties.

Publication Source (Journal or Book title)

Science of Advanced Materials

First Page

1830

Last Page

1837

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