Design of electret polypropylene melt blown air filtration material containing nucleating agent for effective PM2.5 capture

Abstract

Particulate matter (PM) pollution has become a serious threat to public health, climate and ecosystems.Therefore, filtration materials with high filtration efficiency and low air resistance are in urgent need. Electret filters that can significantly improve filtration efficiency without increasing pressure drop are widely used for air filtration. However, long-term maintenance of the electrical charges on electret filters, particularly at high temperatures and in wet conditions, is still a challenge. Herein, we report the fabrication of a novel electret filter with a fluffy structure, high porosity and satisfactory filtration stability using polypropylene (PP) as the matrix polymer and magnesium stearate (MgSt) as the charge enhancer. Benefiting from the fluffy structure created by melt blown at a large die-to-collector distance (DCD), the pressure drop decreased from 67.0 Pa to 52.9 Pa at an air flow rate of 85 L min À1

Novel design of alumina foams with three‐dimensional reticular architecture for effective high‐temperature particulate matter capture

“…After cleaning, only fewer particles were found, suggesting that the sample CB3 could be reused due to its robustness (Figure E). Furthermore, comparison between CB3 and various porous materials in previous studies is shown in Table . It is demonstrated that as‐prepared CB3 exhibits a relatively high removal efficiency at an ultra‐low pressure drop, and undergoes a much higher testing temperature compared with other materials.…”

“…Furthermore, comparison between CB3 and various porous materials in previous studies is shown in Table 1. [35][36][37][38][39] It is demonstrated that as-prepared CB3 exhibits a relatively high removal efficiency at an ultra-low pressure drop, and undergoes a much higher testing temperature compared with other materials. Theoretically, the upper limit of service temperature of as-prepared alumina foams could be much higher than the testing temperature since porous alumina materials could undergo extremely high temperature up to 1600°C.…”

Multifunctional Polymer Composites Produced by Melt-Blown Technique to Use in Filtering Respiratory Protective Devices

“…The addition of magnesium stearate (MgSt) to the polypropylene melt in a melt-blown process increased its electrostatic potential and improved its filtration properties and air permeability (99.22% filtration efficiency with an airflow resistance of 85 L/min at 92 Pa). The developed composite was characterized by excellent electrostatic stability ensuring long storage and use times [7].…”

Filtration Efficiency of Electret Air Filters Reinforced by Titanium Dioxide

“…The other approach is to add a nucleating agent that increases the crystallinity of polymers and to obtain greater crystalline and amorphous regions to house more space charges. The nucleating agents are magnesium stearate [13], stearate [14], modified rosin [14], polycarbonate [15], tourmaline [16], DMDBS (3:2, 4-bis(3,4-dimethyldibenzylidene) sorbitol) sorbitol) [17], and NA11 (sodium 2,2 -methylene-bis(4,6-di-tertbutylphenyl)-phosphate) [17].…”