新型聚芳醚腈酮中空纤维超滤膜的研究

STUDY ON NOVEL POLY(PHTHALAZINONE ETHER NITRILE KETONE)HOLLOW FIBER ULTRAFILTRATION MEMBRANES

以含二氮杂萘酮结构聚芳醚腈酮(PPENK)为膜材料,N-甲基-2-吡咯烷酮(NMP)为溶剂,采用干-湿相转化法制备了中空纤维超滤膜。考察了聚合物浓度、添加剂含量以及纺丝过程中空气间隙、凝胶浴温度和纤维壁厚对膜结构及性能的影响。结果表明,当聚合物浓度为13%,添加剂EgOH含量α=0.9时,膜通量可达770L·m-2·h-1,对BSA的截留率在90%以上;增大空气间隙可使膜的截留性能提高,但膜通量有所下降,最佳空气间隙为5～8cm;凝胶浴温度的升高增大了膜的通量,截留率下降幅度不大,凝胶浴温度宜控制在21～25℃范围内;纤维壁厚在0.15～0.18mm时膜性能最佳。

By using poly（phthalazinone ether nitrile ketone）（PPENK） as membrane material, N-methyl-2-pyrrclidone （NMP） as solvent, the hollow fiber membrane were prepared by the dry-wet phase inversion technique. The effect of PPENK concentration, additive content, air gap distance, gel-bath tem- perature and fiber thickness during the membrane prepared process on the structure and property of PPENK hollow fiber ultra filtration membranes were studied. By the retention test of BSA, the results showed that the pure water flux of membranes was 770 L·m^-2·h^-1 when the PPENK concentration was 13% and ratio of near-to cloud point α=0.9 for EgOH content; with the increase of the air gap distance, pure water flux of the membrane decreased while the retention of BSA increased, the best air gap range was 5-8 cm; With the increase of gel-bath temperature, pure water fluxes increased while the retention of BSA decreased. The proper gel-bath temperature was 21-25℃ and the optimum range of fiber thickness was about 0.15-0.18 mm.