Abstract: Poly-p-phenylene terephthalamide(PPTA) pulps were prepared by the semi-continuous direct polycondensation process using twin screw extruder as the main reactor. It was shown that a low temperature was needed for pre-polycondensation. The temperature for the main reaction in the twin screw extruder should be about 70℃ and the residence time of the reactive materials in the twin screw extruder should be longer than 3 min. Increasing the rotation speed of the screw had almost no effect on the relative molecular mass of PPTA pulps but had negative effect on the performance of the pulps due to too short residence time of the material in the twin screw extruder. This process had good prospects in commercial production of PPTA pulps.

摘要： 采用啮合同向旋转的双螺杆挤出机作为主反应器，半连续化直接缩聚法制备了聚对苯二甲酰对苯二胺（PPTA）浆粕.结果发现，较低的预缩聚反应温度有利于得到高相对分子质量的PPTA浆粕;而在双螺杆挤出机中主反应温度则应控制在70℃左右为宜;物料在双螺杆中的停留时间超过3 min，才满足制备PPTA浆粕的工艺要求.螺杆的转速对PPTA 浆粕的相对分子质量的提高不显著，若转速太快，使物料在双螺杆中的停留时间缩短，反而不利于得到性能较好的PPTA浆粕.本研究为直接缩聚法制备PPTA浆粕的进一步放大打下了基础.