Fabrication of Polypropylene Air Filter by Melt-blown Technique: Evaluation of Electrostatic Filtration and Antibacterial Test
| Autor: | SIM KENG SIANG, 沈健祥 |
|---|---|
| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 This experiment was successfully prepared melt-blown air filters with electrostatic ability and anti-bacterial function by melt-blown technique. First, the polypropylene masterbatch is added to the melt-blown machine for melting purpose. Next, the molten polypropylene will be extruded from the die under high temperature and pressure hot air to blow the molten polymer onto the collector and the melt-blown web is formed. In this experiment, the process parameter such as: temperature of the die, air flow speed, die to collector distance will be discussed later in the results and discussions. Subsequently, the charging voltage and filtration efficiency of polypropylene melt-blown air filter will be tested and analyzed. In the end, the optimum parameter will be chosen and applied in the next two experiments. In part two experiment, triclosan is added into the molten polypropylene by using single screw extruder machine. The composite masterbatch will be added into the melt-blown machine to process into PP/TCS melt-blown air filter. The procedure for manufacturing the PP/TiO2 melt-blown air filter is same as making PP/TCS melt-blown air filter. PP/TCS melt-blown air filter will undergo anti-bacterial test whereas PP/TiO2 melt-blown air filter will undergo surface potential test. The filtration efficiency test will be conducted for both melt-blown air filters. From this experiment, it can conclude that fiber diameter decreased when the die temperature, air flow speed and die to collector distance (DCD) increased. The increased of charging voltage causing the surface potential of the sample increased, but unfortunately the decay speed of the surface potential was the fastest than other samples having a lower charging voltage. In filtration efficiency test, all the single PP melt-blown air filter samples had a low filtration efficiency. When the number of melt-blown air filter increased to two, the filtration for all samples increase significantly, the results were in between 60- 80%. PP 260 D had the best filtration performance which filtration efficiency was about 85%. In anti-bacterial test, it is clearly shown that the higher the content of triclosan, the greater the anti-bacterial ability. In surface potential test, the longer the charging time, the higher the surface potential for the samples, but the surface potential will remain constant after a long time. The reason is the sample already reached saturated status. Last, the filtration efficiency test for charged PP/TiO2 melt-blown air filters had a greater performance when compare to uncharged single and double PP melt-blown air filters. The filtration efficiency for PP/TiO2 15 reaches 75.2% which is very closed to the double PP melt-blown air filters results. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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