Abstract: In order to study the stability of intumescent char layer, the in fluence of MoO₃ on the percen-tage of residual char of a flame retardantintum escent coatingswas investigated by thermal gravity analysis(TGA).The experimental results showed that the add ition of  MoO₃ ther investigated. TGA studies showed that MoO₃ could improve the residual charmass of binder,ammonium po lyphosphate (APP), pentaery thritol ( PER) and APP /PER respectively. It is found that a new exothermic peak appears at about 665℃ on DSC curves of 9%  MoO₃ , which seems that some new substances were formed possibly. XRD analysis showed that the intumescent char layer were made of MoO₂, MoOPO₄ and a little  MoO₃ , which was agreed with  MoO₃  result of DSC analysis.

Key words: trioxide molybdenum, thermal analysis, mass of residual char, synergistic effec;t flameretardant coatings

摘要： 为了研究膨胀型防火涂料的炭层稳定性, 本文采用热重分析 ( TGA) 研究了MoO₃对膨胀型防火涂料残炭率的影响。试验结果表明, 掺入 MoO₃能降低涂料的分解速度, 增加残炭量; 并且随 MoO3掺量的增加, 残炭量增加。在此基础上, 研究了 MoO₃对该涂料各组分残炭量的影响, TGA 分析表明, M oO3能提高树脂基体、聚磷酸铵、季戊四醇和聚磷酸铵 /季戊四醇的残炭量。此外, 对掺入 9% MoO₃的涂料试样进行差示扫描量热法 ( DSC) 测试, 发现在 665℃出现了新的放热峰, 推断可能有新物质生成; 对该试样灼烧后, 以 X- 衍射 ( XRD) 测试, 结果发现该试样的热分解产物中含有 MoO₂、MoOPO₄和少量的MoO₃等物质, 这与 DSC 的测试结果吻合。

关键词: MoO_3; 热分析, 残炭量, 协同效果, 防火涂料