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RISS 인기검색어
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- 저자 : 이해길 (검색결과 6 건)
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실리카 충전 가황물의 물성에 미치는 실란 커플링제와 활성제의 영향
이해길 부경대학교 산업대학원 2014 국내석사
실리카가 타이어산업에서 보강재로 사용하면서 회전저항(Rolling resistance) 감소, Wet grip성 향상을 통해 이산화탄소 절감 효과가 증명되면서 친환경 소재로 널리 사용되고 있다. 일반적인 실리카는 실라놀기가(Si-OH) 표면에 존재하여 친수성을 띄며 강한 극성을 이루는 물질로서 Polymer인 고무와의 상용성이 떨어져 원하는 물성 구현에 많은 어려움이 있었다. Coupling agent인 유기실란의 개발과 실리카 분산제, 치합식인 Intermeshing rotor 개발이 상용화에 큰 몫을 하였다. 본 연구에서는 천연고무 베이스의 실리카 배합물의 물성에 영향을 주는 첨가제인 실란커플링제와 활성제의 상관관계를 규명하기 위해 가교특성, 기계적 물성, 동적 점탄성, 분산성등을 조사 비교하여 양호한 물성을 구현하는 적정 함량비를 산출하였다. 실리카 함량 대비 8~10% 수준의 실란커플링제를 사용 하였을때 가장 양호한 마모특성과 Heat build up, tanδ 60℃ 값을 보였고, 활성제의 경우 실란 커플링제 사용에 따른 물성변화량에 비해 미비한 상승효과를 보였지만, 실리카 재응집 현상을 줄여 무우니점도 하락과 가교밀도 상승 및 분산성 향상효과를 보였다.
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Environmental issues such as the rise of sea level and an increase of average temperature of the earth are being caused due to climate change according to global warming all over the world. Green-house gases receive attention as the main cause of global warming, and the policies to reduce green-house gases are being implemented in each country. Especially, architectural field can be referred to the one with high discharge of green-gases because it has high consumption of energy. Reducing the load of building energy shall take precedence in order to reduce the discharge of these green-gases. The technologies to reduce the load of building energy include enhancement of insulation performance of the building covering, using high-efficiency equipment and introduction of renewable energies etc. Among these technologies, the building covering is largely divided into walls and windows, and windows of a building correspond to approximately 1/10 level compared to insulation performance of walls due to their thermal weak parts. The indoor temperature is increased due to incoming solar radiation through windows during summertime, which becomes the main cause of cooling load. In energy reduction, even optical parts as well as insulation performance of windows shall be considered. The study is aimed at verifying insulation performance by supplementing glass performance of combined operating windows, and checking reduction of consumption of heating & cooling energy during summertime and wintertime through shades which are the function of combined operating windows and the operation method of an insulated shutter. The results of the experiment are as follows. 1) The improvement of insulation performance was verified with 1.075 W/㎡K as a result of measuring insulation performance by supplementing the glass part of combined operating windows. Besides, as a result of measuring it with applying an insulated shutter in order to check performance of an insulated shutter, insulation performance was improved by approximately 28% with 0.765 W/㎡K compared to the ones before an insulated shutter was applied. 2) In the experiment of cooling in the summertime, reduction in consumption of cooling energy was verified by adjusting the shades angle into 60°, 45°, 30° respectively. As a result, it showed the greatest reduction in consumption of cooling energy at the shades angle of 30°, and it was found that consumption of cooling energy was reduced by approximately 46% compared to the windows to be compared. 3) It was found that reduction in consumption of heating energy according to the fact whether an insulated shutter is opened or closed in the wintertime. As a result, it was found that consumption of heating energy was reduced by maximum 11% compared to the windows to be compared in the experiment that was conducted while an insulated shutter was opened during daytime and closed during nighttime, and it is judged that reduction in consumption of heating energy of an insulated shutter is more effective during nighttime than daytime.
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