利用双螺杆挤出机溶解聚丙烯腈

Dissolving polyacrylonitrile with twin-screw extruder

为了提高生产效率,简化操作步骤,并制得质量稳定的高黏均分子量(Mη)聚丙烯腈(PAN)纺丝原液,研究了利用双螺杆挤出机溶解PAN的新方法。二阶螺杆采用T形搭配方式,并在出料口加装过滤装置。溶剂的选择在PAN溶解理论的基础上综合考虑了不同溶剂的溶解能力,找到了适合螺杆溶解要求的混合溶剂。同时将制得的溶液利用干喷湿纺工艺进行纺丝,得到线密度小、高强度的原丝,以验证此体系的可靠性。结果表明此溶解方式可以满足高性能PAN原丝的纺丝要求,同时产出溶液质量稳定且效率更高。

In order to improve production efficiency, simplify procedure, and produce polyacrylonitrile （PAN） spinning dope, which isstable and has high viscosity-average molecular weight （Mη）, a new PAN dissolution method with twin-screw extruder was developed. A mode of T-combination was used to frame the second order twin-screw and a filter was installed in the outlet port. A mixed solvent suitable for screw extruder based on PAN dissolution theory and dissolution ability of solvents was selected. The dissolved PAN was used in dry jet wet spinning and high strength fiber with low linear density was made. The twin screw method of dissolving PAN satisfied high performance fiber production requirement, and the solution quality was stable and more productive.