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Received November 18, 2007
Accepted December 26, 2007
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초임계 메탄올을 이용한 가교 폴리에틸렌의 탈가교화
Decrosslinking of Cross-linked Polyethylene using Supercritical Methanol
Soon Man Hong
Hang-kyu Cho
Chong Min Koo
Jang Hoon Lee1
Wan Yong Park1
Hong-Shik Lee2
Youn-Woo Lee2†
한국과학기술연구원, 136-791 서울시 성북구 하월곡동 39-1 1영보화학(주), 305-305 대전시 유성구 복용동 236 2서울대학교 공과대학 화학생물공학부, 151-742 서울시 관악구 신림동 산56-1
Polymer Hybrids Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, Seoul 136-791, Korea 1Youngbo Chemical Co. Ltd., 236 Pokyong-dong, Yoosung-gu, Daejeon 305-305, Korea 2School of Chemical and Biological Engineering & Institute of Chemical Processes, Seoul National University, San 56-1, Shilim-dong, Gwanak-gu, Seoul 151-742, Korea
Korean Chemical Engineering Research, February 2008, 46(1), 63-68(6), NONE Epub 28 February 2008
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Abstract
초임계 유체 공정을 이용하여 가교 폴리에틸렌 수지를 탈가교화하여 재활용하는 방법을 조사하였다. 가교 폴리에틸렌 수지는 메탄올을 이용한 초임계 반응 시 탈가교화가 이루어져 재활용 될 수 있다. 초임계를 이용한 탈가교화 반응은 반응온도에 의해 크게 영향을 받으며 360 ℃부터 400 ℃ 구간에서 온도의 증가에 따라 탈가교화가 급격히 촉진되었다. 반응온도의 증가에 따라 생성물인 탈가교 폴리에틸렌의 가교도, 분자량, 기계적 물성은 감소했지만, 360 ℃에서 탈가교된 폴리에틸렌은 가교전의 원료로 사용된 폴리에틸렌과 비교할만한 연신강도와 내충격강도를 보였다. 본 연구의 모든 반응조건에서 폴리에틸렌의 주쇄의 화학구조는 반응조건에 거의 영향을 받지 않았다.
We investigated the recycling method to re-plasticize cross-linked polyethylene by using supercritical methanol. The cross-linked polyethylene is successfully fragmented to thermoplasticized polyethylene with little degradation reactions in supercritical fluids. The thermo-plasticization reaction was accelerated with increase in temperature in the range from 360 ℃ to 400 ℃, resulting in decrease in crosslinking density, molecular weight and mechanical properties. However, the thermoplasticized polyethylene at 360 ℃ showed comparable tensile strength and impact strength with a raw resin of crosslinked polyethylene. Chemical structure of main chain of polyethylene was not affected by reaction condition.
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Kamimura A, Yamada K, Kuratani T, Taguchi Y, Tomonaga F, Chem. Lett., 35(6), 586 (2006)
Lee JR, Lee DG, Hong SM, Kang HJ, Polym.(Korea), 31(1), 25 (2007)
Kim SC, Polym.(Korea), 29(1), 1 (2005)
Hong SM, Economy J, Macromolecules, 28(19), 6481 (1995)
