Heat Transfer Study of Polypropylene-Based Intumescent Systems during Combustion
Heat Transfer Study of Polypropylene-Based Intumescent Systems during Combustion
复制标题
DOI：
10.1177/073490419701500502
复制
发表时间：
1997-09
影响因子：
1.9
通讯作者：
L. Morice;S. Bourbigot;J. Leroy
中科院分区：
文献类型：
--
作者：
L. Morice;S. Bourbigot;J. Leroy
研究了聚丙烯（PP）-聚磷酸铵（APP）/季戊四醇（PER）和PP-Hostaflam AP 750（AP 750）膨胀型阻燃体系的火灾行为和传热性能。我们已经表明，与APP/PER体系相比，使用商业添加剂AP 750的PP的防火性能（LOI、UL-94和锥形量热仪）得到了显著改善。这可以通过由PP-AP 750开发的膨胀型涂料的保护来解释，该膨胀型涂料在高温（450-550°C）下仍然有效，并且发展更快。在锥形量热计的条件下的温度曲线的测量表明，用PP-AP 750达到的温度低于用PP-APP/PER获得的温度。此外，PP-AP 750的温度始终保持低于PP快速降解速率开始的温度，这意味着聚合物基体从未快速降解。最后，降解前沿的温度（Td）的计算允许得出这样的结论，即需要降解前沿位置的低Td和相对高的位移速率来提高膨胀型系统的效率。
We have studied the fire behavior and the heat transfer in the in tumescent formulations polypropylene (PP)-ammonium polyphosphate (APP)/pentaerythritol (PER) and PP-Hostaflam AP750 (AP750). We have shown that the fire proofing properties (LOI, UL-94 and cone calorimeter) of PP was strongly improved using the commercial additive AP750 in comparison with the system APP/PER. This is explained by the protection of the intumescent coating developed from PP-AP750 which is still efficient at high temperature (450-550°C) and which is developed faster. The measurement of temperature profiles in the conditions of the cone calorimeter shows that the temperatures reached with PP- AP750 are lower than these obtained with PP-APP/PER. Moreover, the tempera ture of PP-AP750 always remains lower than the temperature of the beginning of the fast degradation rate of PP which implies that there is never a fast degrada tion of the polymeric matrix. Finally, the computation of the temperature of the degradation front (Td ) allows to conclude that low Td and relatively high displace ment rate of the place of the degradation front is needed to increase the efficiency of intumescent systems.