Study on cyclic olefin copolymer (COC) for moisture resistance in the application of electrostatic filters

Y.-H. Chou*, D.-L. Yang, J.-T. Huang, N.-L. Liu, C.-H. Hou, K.-C. Wu, Y.-H. Hsu, National Taiwan University, Taiwan

Among the four major air filtration methods, the electrostatic attraction is currently the most effective way to filter particles in the range of 0.1 to 0.4 microns. However, the filtration efficiency can easily be decreased in a high humidity environment due to the loss of electrostatic charges during the filtration of a humid air. Regions like climates in islands, tropical or subtropical regions are usually encountered this issue. Studies also showed that the filtration quality of electret filters could significantly reduce under a humid environment.

To overcome this problem, we present our study on using cyclic olefin copolymer (COC) to create a moisture resistant masking filter for maintaining the level of electrostatic potential. We also demonstrated that this addition of COC masking layer, it could provide a means to recover electrostatic potential of the electrostatic filter. COC is a polymer that has superior characteristic of low density, high transparency, extremely low water absorption, excellent water vapour barrier properties, good mechanical behavior, high rigidity, and mechanical strength and hardness [3]. It can be dissolved in non-polar solvents such as toluene [4]. To create a masking filter for protecting an electrostatic filter, we use a standard dip coating method to coat COC on a Polypropylene (PP) non-woven fabric. [5] The commercial 3M electret air filter was chosen as the electrostatic filter for this study. The optimized COC coating solution was developed, and it is...

Session: G4 - Electret Filter Media
Day: 14 March 2018
Time: 09:00 - 10:15 h

Learn more at FILTECH 2018 - Register Now!