Electrostatic Capture Efficiency Enhancement of Polypropylene Electret Filters with Barium Titanate

Liu

J of Applied Polymer Sci

et al. 2017

In recently years, fine particulate matter (PM) pollution has drawn worldwide attention due to its serious threat to public health, visibility, climate, and ecosystems. The electret filter that can significantly improve the filtration efficiency without increasing the pressure drop has been widely used to for PM filtration. However, there were still some blind spots in the corona charging process, such as the interaction effects between the charging factors on the electret performances and the electric spark phenomenon during charging, which generate challenges for further improving the electret performance. Herein, we report an inconspicuous charging phenomenon that a blue‐colored glow was observed during corona charging process. We named it as “Waterfall glow”, because a lot of charges appear to flow. The relationship between the blue‐colored glow and the filtration efficiency was investigated. The results showed that the filtration performance of the electret melt blown was positively correlated to the intensity of blue‐colored glow. The phenomenon enables us to online predict the filtration performance of the electret material in the actual production. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45948.

Section: Introductionmentioning

confidence: 99%

Online prediction of the filtration performance of polypropylene melt blown nonwovens by blue‐colored glow

Liu

J of Applied Polymer Sci

et al. 2017

“…Nevertheless, these ceramic materials are limited by their low breakdown strength and difficult processability. During the past decade, many researchers had focused their attentions on dielectric polymer materials . BT was often selected as the functional filler to filled in polymer matrix to enhance the dielectric constant .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of mechanical strength associated with interfacial tension between barium titanate and acrylonitrile–butadiene rubber with different acrylonitrile contents by surface modification

Zhu

Guo

J of Applied Polymer Sci

2017

Acrylonitrile–butadiene rubber (NBR) with different acrylonitrile (ACN) contents was filled with barium titanate (BT) to prepare the polymer dielectrics. The neat NBR, NBR/untreated BT, and NBR/bis‐(γ‐triethoxysilylpropyl)‐tetrasulfide (silane coupling agent KH845‐4) modified BT (MBT) composites were prepared. At low ACN content (ACN content 20 wt %), the tensile strength of the NBR/MBT composites increased by 173.6% from 2.69 to 7.36 MPa compared to the neat NBR. The pleasing results were not found in those composites with high ACN content. Both surface modifications of BT and NBR with low ACN content would result in lower interfacial tension between BT and NBR. A strong interfacial adhesion was observed between MBT and NBR with 20 wt % ACN content. The interfacial adhesion had great contribution to the mechanical strength of composites. Moreover, the dielectric properties of composites were also investigated in detail. The addition of BT enhanced the dielectric constant of composites markedly. This study can be applied in manufacturing electronic devices, which are subjected to oily environments for a long time. At the same time, the study can provide some help for researchers to select the polymer matrix and the appropriate surface modification agent of functional filler. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45936.

“…et al (2014Choi H.-J. et al ( , 2015 and electrification method and process was by Kawabe M. et al (2009), Kilic A. et al (2015. Fig.…”

Section: Single Fiber Collection Efficiency By Electrostatic Effectmentioning

confidence: 99%

“…(1976) invented an manufacturing method of electret filter, electret fibrous filter has been used popularly as a high performance air filter. Investiga- (2015), Kilic A. et al (2015). Time change of electret fiber was investigated by Kanaoka C. et al (1984b), Lee M., et al (2002), Choi H.-J.…”

Section: Single Fiber Collection Efficiency By Electrostatic Effectmentioning

confidence: 99%

Fine Particle Filtration Technology Using Fiber as Dust Collection Medium

Kanaoka

2019

KONA

Researches relating dust collector using fiber as particle collection body i.e., air filter, cartridge filter and nonwoven bag filter, were reviewed. Their filtration process was classified into 3 stages, i.e., Stage 1.inner filtration I, Stage 2.inner filtration II and Stage 3.surface filtration. Collection mechanisms of fresh circular fiber have been well understood and so-called classic filtration theory is applicable except single nano-particle, where discussion about the possibility of thermal rebound is necessary. In Stage 1, effects of shape of both fiber and particle, and filter structure, non-uniformity are the important issues. In Stages 2 and 3, filtration process becomes very complicated because of many affecting parameters. Main target in Stage 2 is to develop effective scheme to describe the phenomena and to find filter structure having a large holding capacity. Most important issue in Stage 3 is to develop the effective cleaning technique to minimize the dust emission based on rational but not empirical scheme.