PPTA复合纤维素纤维纸的制备及性能研究

Preparation and Properties of PPTA Composite Cellulose Fiber Paper

关键词:  PPTA  纤维素纤维纸  涂布  复合

Key Words:PPTA  cellulose fiber paper  coating  composite

摘要:本研究探讨了PPTA与纤维素纤维纸复合的工艺技术，将中等分子质量的聚对苯二甲酰对苯二胺（PPTA）在DMPU/LiCl中溶解并配制成稳定的溶液，采用刮涂法将其定速刮涂至普通的纤维素纤维纸表面，经凝固浴处理，使PPTA在纤维素纤维纸表面形成凝胶涂层，经干燥得到PPTA涂布纤维素纤维纸。PPTA表面涂层的引入改善了纤维素纤维纸表面的致密性和连续性，且其可以与纤维素纤维纸形成牢固的相互作用。在PPTA质量分数约5.7%的条件下，复合纸的拉伸强度从纤维素纤维纸的25.6 MPa提高至79.7 MPa，增长了211%；湿抗张强度从0.134 kN/m提高至0.731 kN/m，增长了446%；撕裂度从316.3 mN提高至662.3 mN，增长了109%，而且复合纸的阻燃性有显著增长，离火3 s内可自行熄灭，复合纸的电击穿强度达20.9 kV/mm，比纤维素纤维纸提高了90%。

Abstract:This paper presented an investigation into the process technology of poly（p-phenylene terephth amide）（PPTA）composite with cellulose fiber paper. The medium molecular weight PPTA was dissolved in DMPU/LiCl and formulated into a stable solution， which was then scraped onto the surface of ordinary cellulose fiber paper by the scraping method at a constant speed. The resulting gel coating was treated with a solidifying bath and subsequently dried to obtain PPTA-coated cellulose fiber paper. The introduction of PPTA surface coating resulted in an improvement in the denseness and continuity of the cellulose fiber paper surface， thereby facilitating a strong interaction with the cellulose fiber paper. The tensile strength of the composite paper increased significantly when the PPTA content was approximately 5.7%. The tensile strength of the cellulose fiber paper was 25.6 MPa， while that of the composite paper was 79.7 MPa，with a 211% increase. Similarly， the wet tensile strength increased from 0.134 kN/m to 0.731 kN/m，with a 446% increase. Additionally， the tear degree increased from 316.3 mN to 662.3 mN，with a 109% increase. Furthermore， the flame retardancy of the composite paper had increased significantly. It could self-extinguish within 3 when exposed to fire. Additionally， the electric breakdown strength of the composite paper was 20.9 kV/mm， which was an 90% increase compared to the original cellulose fiber paper.