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提出了添加液氮以促进芳纶1414合成体系换热的方法,即将溶液的最高温度控制在2.5℃以下,同时在反应初期(2～11min)使温度下降速率为1.3℃/min.与冰水浴间接换热相比,本法可获得更低的反应温度与更快的移热速率,有利于抑制缩聚反应初期的暴聚现象.分析结果显示,液氮的加入与相变还可促进反应物剧烈混合,传质效果的改善也有利于显著提高产品质量,最终得到了比浓对数粘度高达6.9dL/g的产品.
The method of adding liquid nitrogen to promote the heat transfer of aramid 1414 system was proposed, that is, the maximum temperature of the solution was controlled below 2.5 ℃ and the temperature drop rate was 1.3 ℃ / min in the initial stage of the reaction (2 ~ 11min) Compared with indirect heat exchange, this method can obtain lower reaction temperature and faster heat transfer rate, which can help to suppress the phenomenon of agglomeration in the initial stage of polycondensation reaction.The analysis results show that addition of liquid nitrogen and phase transformation can also promote the reaction Intense mixing, mass transfer effect is also beneficial to improve the quality of products significantly improved, and ultimately get the inherent viscosity of up to 6.9dL / g products.