| abstract |
The invention discloses a modification method of a heterocyclic aramid fiber spinning dope, a modified heterocyclic aramid fiber spinning dope and application, and relates to the technical field of heterocyclic aramid fiber preparation. By adding spinning auxiliaries to the polymer solution after the polycondensation reaction of p-phenylenediamine, terephthaloyl and heterocyclic diamine (that is, the heterocyclic aramid spinning stock solution) for blending, without changing the polymerization process Under the conditions of the dissolution process, the surface tension of the heterocyclic aramid spinning dope is significantly reduced, and the viscosity of the heterocyclic aramid spinning dope is increased, thereby obtaining a spinning dope with lower surface tension and higher viscosity. (that is, the modified heterocyclic aramid spinning solution). The spinning dope with low surface tension and high viscosity is beneficial to improve its spinnability in wet and dry spinning, and helps to prepare higher performance heterocyclic aramid filaments at higher spinning speed. The preparation process provided by the invention is convenient and simple, has low cost, and is suitable for large-scale production. |