Thermal degradation study of fire resistive coating containing melamine polyphosphate and dipentaerythritol |
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Authors: | Guojian Wang Jiayun Yang |
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Affiliation: | aSchool of Materials Science and Engineering, Tongji University, Shanghai 201804, China;bKey Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, Shanghai 201804, China |
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Abstract: | A melamine polyphosphate (MPP)/dipentaerythritol (DPER) mixture was used as fire retardant additives for preparing waterborne intumescent fire resistive coating. The thermal degradation of the MPP/DPER mixture and of the coating was studied by TGA and FTIR. The resulting char of the coating was investigated by XPS, SEM and energy dispersive spectroscopy (EDS). The results showed that the thermal degradation behavior of the MPP/DPER mixture was similar to that of the coating. They decomposed to nonflammable gases, and formed intumescent char layer containing phosphorus oxide at high temperature. The EDS results proved that the resulting char was gradually oxidized with the temperature increase. The SEM micrographs showed that the average cell size of the char layers became bigger and the cell size distribution became wider as the temperature increased from 500 °C to 800 °C, and this non-uniform char layer could damage the fire protection of the coating. |
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Keywords: | Thermal degradation Intumescent Fire resistive coating Melamine polyphosphate Dipentaerythritol |
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