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Recently, the recognition of the industrial environment has been improved and the restrictions on the regulations on the use of refractory products have been strengthened, so that the development of fire resistant polymer fusion materials is required. Most of the polymers are organic substances composed of carbon and hydrogen, they easily burn. Therefore, the polymers have a serious problem that can cause human accidents and property damage in case of fire. Therefore, this study aims to research and develop silicone rubber fusible materials which can be used in various industrial fields and have excellent fire resistance. ** This research was supported by the National Strategic Project-Carbon Upcycling of the National Research Foundation of Korea(NRF) funded by the Ministry of Science and ICT(MSIT), the Ministry of Environment( ME) and the Ministry of Trade, Industry and Energy(MOTIE). (2017M3D8A2086050)
The effectiveness of a filter apparatus depends on the construction and the material of the filter medium support tray. Some common materials are aluminum, cast iron, ductile iron and material compounds out of steel and rubber. These elements are showing a lot of disadvantages as for example low chemical and unfavorable drainage, considerable abrasion, limited working life, fluid absorbency and bad sealing. Polypropylene turned out to be the best material due to it`s most favorable price-power-performance and its interesting combination of excellent properties. Herein, different amounts of the silica, gf, POP was incorporated in PP for filter recess and filter base. Their parts were also thoroughly investigated in terms of tensile properties, flexural properties, izod impact properties, thermal stability and so on. <sup>**</sup>Acknowledgement : This work was supported by a grant (10046535) by the Ministry of Trade, Industry and Energy (MOTIE), Republic of Korea (2014)
In this study, silicone rubber composites filled with hybrid inorganic fire-proof fillers were analyzed for mechanical properties and thermal stability. A mineral fiber composite was found to be superior to a wollastonite composite through gas torch flame tests and hybrid composites have improved fire resistance than the mineral fiber composite. Wollastonite was found to be well dispersed in silicone rubber composites observed by SEM and could compensate for the low dispersibility of mineral fibers. The thermal stability of the composites was confirmed by TGA analysis and the ceramization tendency of the hybrid composites was analyzed by XRD analysis. The mechanical strength of wollastonite composite was measured by UTM. It was found that the addition of wollastonite was able to slightly compensate the low mechanical strength of mineral fiber filled composites by improving the dispersibility of fillers. 본 연구에는 하이브리드 무기계 내화 필러를 충전한 실리콘 고무 복합체의 내화 성능 및 열적 안정성과 기계적 강도를 분석하였다. 가스토치 시험 결과 미네랄 섬유 복합체는 규회석 복합체보다 내화 성능이 우수하며 규회석과 미네랄 섬유의 하이브리드 복합체는 미네랄 섬유 복합체보다 내화성능이 향상되었다. SEM을 통해 규회석은 실리콘 고무 복합체 내에서 분산성이 우수함을 확인하였고 미네랄 섬유의 낮은 분산성을 보완할 수 있었다. TGA 분석을 통해 복합체의 열적 안정성을 확인하고 XRD 분석을 통해 하이브리드 복합체의 세라믹화 경향을 분석하였다. 규회석 복합체는 UTM를 통해 분석한 결과 기계적 강도가 가장 우수하며 하이브리드 복합체는 규회석 필러의 첨가로 분산성이 향상되어 미네랄 섬유의 낮은 기계적 강도를 소폭 보완할 수 있었다.
Electrical conductivity electromagnetic interference shielding(EMI) function materials have many potential applications. In order to analyze the EMI performance of graphite by size, composites were made by mixing with paraffin wax according to the size and content of graphite(KS6-150). In addition, we tried to check the existence of hybrid property by mixing graphite of different size. The composite was made into a donut-shaped specimen having an inner diameter of 3 mm and an outer diameter of 7 mm. The specimens were analyzed on a network analyzer using the GPC-7 kit in the frequency range of 2 GHz-18G Hz. KS6, the smallest size, showed the lowest emi properties. However, KS44 exhibited the best emi property even though it was not the largest size graphite, and KS75 and KS150 showed intermediate results between KS6 and KS44, even though they were larger than KS44.
Graphite exhibits electromagnetic wave attenuation and high electrical conductivity. In this study, we analyzed the electromagnetic interference shielding effectiveness (EMI SE) performance and electric conductivity of composites fabricated by varying the size (mean size: 6-100 m) of graphite fillers and explained resulting attributes through the relative permittivity and geometrical characteristics of the filler. When the graphite/paraffine wax composite was fabricated using large-sized graphite (KS150), the spacing between the graphite fillers became widened, enabling electromagnetic waves to leak through the gap. The analysis results indicated that KS150 graphite exhibited an EMI SE performance of under 10 dB when the filler content was 30 wt%. However, when the content was increased to 50 wt%, the EMI SE performance improved sharply to 40 dB. In contrast, when the composite was filled with small-sized graphite (KS6), having a high ratio of surface to volume, the EMI SE performance was greater than that with the largesized graphite at low loading. The results related to the EMI shielding performance of graphite-filled composites revealed that the size of the filler greatly affects the EMI SE. The composite using KS75 showed an EMI SE performance of 53.0 dB and electrical conductivity of 2,000 S/m.