PET/CA根须状蓬松纳米纤维复合膜的制备及其烹饪油烟过滤性能

为有效净化烹饪油烟，采用共溶剂静电纺丝技术，通过调控聚酯（PET）和醋酸纤维素（CA）的共混比，制备根须状蓬松纳米纤维复合膜。借助扫描电子显微镜、接触角测试仪及自动滤料测试系统等分析所制备纤维膜的微观形貌、表面润湿性及油烟过滤性能。结果表明：所制备的8:2纳米纤维复合膜成形良好，具有明显的根须状结构，直径集中在根须100nm和根冠300nm左右；且堆积蓬松，孔隙率、堆积密度分别达93.85±1.71%、0.023±0.008；水接触角154±1°，油从初始接触角84°到吸收为0°仅需2s，具有特殊表面润湿性；模拟烹饪油烟过滤测试表明：过滤效率达92%，过滤压降仅为36Pa，且经20次循环测试后其过滤效率基本不下降，仍保持在91%以上；在100 min连续过滤测试后，其过滤效率仍大于90%，过滤阻力规律性缓慢上升，满足烹饪油烟过滤的需求。

Preparation of PET/CA root hair-like fluffy nanofibrous composite nonwovens and its cooking oil fume filtration performance

In order to effectively purify cooking fumes, the root-like fluffy nanofibrous composite nonwovens were fabricated through co-solvent electro-spinning by adjusting the ratio of polyester (PET) and cellulose acetate (CA). The morphology, surface and interface wettability and oil fume filtration performance of as-prepared nanofibrous nonwovens were analyzed via scanning electron microscope, contact angle tester and automatic filter material test system. And the results showed when the mixing ratio was 8:2, it had obvious root hair-like structure. The root tip was 100nm and the root cap was 300nm. Not only is the porosity 93.85±1.71%, but the bulk density is as low as 0.023±0.008. Super hydrophobic (Water contact angle 154±1°) and super oleophilic special surface wettability (Oil wetting time is 2s). The simulated cooking oil fume filtration test shows that the filtration efficiency reaches 92%, and the filtration pressure drop is only 36Pa. After 20 cycles of testing, the filtration efficiency basically does not decrease, and still remains above 91%.After 100 min continuous filtration test, the filtration efficiency is still more than 90%, and the filtration resistance rises regularly, meeting the requirements of cooking oil fume filtration.