Research and Development of Coal Flame Retardant System
Coal, a highly fused ring aromatic compound, is a potential charring and flame retardant. Ammonium polyphosphate （APP）, zeolite, and thermoplastic phenolic resin were used to better the coal carbonization flame retardant efficiency. The results of the charring of the tubular pyrolysis furnace, the oxygen index measurement, and thermogravimetric analysis show that, APP can improve the charring of coal, while molecular sieves, nylon, phenolic resin and asphalt can further upgrade the carbonization of coal/APP flame retardant system. Unexpectedly, the foaming agents, melamine didn＇t make a significant improvement in the coal/APP flame retardant. Cone calorimetry presents exciting findings, the flame retardancy of the coal/APP system is almost same as that of the traditional flame retardant system,but the coal/APP system prevails in the costs and hydrophobicity as compared with the traditional system. Unfortunately, the compatibility both among flame retardant components and between the flame retardant and polymer matrix should be enhanced.
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