Journal of Coating Technology and Innovation

ABSTRACT

The key components of intumescent compositions (IC) in many cases are the phosphorus compounds in combination with a carbon source, nitrogen heterocycles, and other special additives. We have studied the thermogravimetric behavior of HDPE composition based on ammonium polyphosphate (APP), pentaerythritol (PER), melamine (MEL) and nano clay (OMMT). A mixture of
fillers was dispersed in HDPE in a Brabender unit at 190 °C. On the DSC curve, recorded in the air,endothermic melting peaks of HDPE (126.6 °C, H = - 46.5 J / g) and PFA (322.6 °C, H = - 20.4 J / g) were identied, and exothermic peak HDPE (242.9 °C, H = 116.1 J / g). Unlike the pure HDPE sample (thermal degradation temperature of the beginning of 391.7 °C) on the DSC curve of the Flled sample with fire retardant thermal degradation is observed around 410 °C and an exothermic peak has multiple characters (sawtooth shape of the low-temperature shoulder), i.e. we can see oscillation output of products of combustion depending on temperature. On the participation of oxygen in the air this process shows corresponding curves DSC and TGA, recorded in an argon atmosphere where the thermal degradation peak is not split. This data suggests that the cause of the oscillating natureof the reaction yield is the thermo-oxidative degradation of fillers. Some assumptions about processes were discussed.

Article History

Received 26 August 2024; Revised 23 September 2024; Accepted 30 September 2024

KEYWORDS

1. Intumescent systems
2. High-density polyethylene (HDPE)
3. Oscillation output