화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Clean Technology, Vol.27, No.1, 24-32, March, 2021
DOI10.7464/ksct.2021.27.1.24  Export Citation
고무증량재 및 플라스틱 충진재의 대체재로 UC와 CM의 재활용
Recycle of Unburned Carbon and Microceramics as Alternatives to Rubber Weight-Adding Materials and Polypropylene Filling Agents
한광수1, 2, 김둘선3, 이동근3, 1, †
  • 1경상대학교 환경보전학과, 52828 경상남도 진주시 진주대로 501
  • 2코셉머티리얼(주), 23120 인천광역시 옹진군 영흥면 영흥남로 293번길 75
  • 3경상대학교 화학공학과, 52828 경상남도 진주시 진주대로 501
Gwang Su Han1, 2, Dul-Sun Kim3, and Dong-Keun Lee3, 1, †
  • 1Environment Protection, Gyeongsang National University, 501 Jinjudae-ro, Jinju-si, Gyeongsangnam-do 52828, Korea
  • 2KOSEP Material Co., Ltd., 75 Yeongheungnam-ro 293 beon-gil, Yeongheung-myeon, Ongjin-gun, Incheon, 23120, Korea
  • 3Department of Chemical Engineering, Gyeongsang National University, 501 Jinjudae-ro, Jinju-si, Gyeongsangnam-do 52828, Korea
E-mail:
초록
미연 탄소(unburned carbon, UC)는 대두유를 포수제로 사용하여 부유선별공정을 통해 최대 85.8 wt%까지 비산재로부터 성공적으로 회수되었다. CM (ceramic microsphere)은 부유선별공정 다음 공정인 하이드로 사이클론 분리공정으로부터 18 wt%의 수율을 얻을 수 있었고 회수한 UC와 CM을 각각 고무증량재와 플라스틱(polypropylene) 충진재의 대체재로 사용하여 산업재로 활용 가능성을 조사하였다. 입자가 큰 UC는 볼밀을 사용하여 평균입경 10.2 μm로 작게 분쇄하였다. 분쇄된 UC를 점토 대신에 고무증량재로 사용하였을 때 인장강도와 신율이 다소 낮게 나와 고무제품의 표준조건을 만족시키지는 못하였다. 따라서 표준조건을 충족시키기 위해 UC는 고무와 보다 긴밀한 결합이 필요하였고, 이를 위한 표면 에너지를 향상시키는 추가적인 처리가 필요하였다. CM은 평균입경이 5 μm의 구형입자로 관찰되었으며, 입자의 표면을 페놀수지, 폴리올, 스테아린산, 올레인산으로 개질하였다. 표면 개질된 CM은 PP (polypropylene) 충진재로 사용되었다. 표면 개질된 CM을 사용한 제품은 흐름성은 양호하였으나 결합력 부족으로 충격강도 및 굴곡강도는 향상되지 못하였다. 그러나 표면 개질된 CM에 유기물과 무기물의 대표적 컬플링제인 실란 1 wt%을 추가적으로 혼합함으로써 충격강도 및 굴곡강도가 크게 향상되는 효과를 얻을 수 있었다.
Unburned carbon (UC) was successfully separated from fly ash by up to 85.8% in weight via froth flotation using soybean oil as a collector. An 18 wt% yield of microceramics (CM) could be achieved by employing a hydro cyclone separator located immediately after the flotation equipment. UC and CM were tested as alternatives to weight-adding material and polymer (especially polypropylene in this study) filler, respectively. Large particles of UC were broken down into smaller ones via ball milling to have an average particle diameter of 10.2 μm. When crushed UC was used as an alternative to clay as a rubber weight-adding material, a somewhat lower tensile strength and elongation rate than the allowed values were unfortunately obtained. In order to satisfy the standard limits, further treatment of UC is required to enhance surface energy for more intimate bonding with rubber. CM was observed in spherical forms with an average diameter of 5 μm. The surface of the CM particles was modified with phenol, polyol, stearic acid, and oleic acid so that the surface modified CM could be used as a polypropylene-filling agent. The flowability was good, but due to the lack of coupling forces with polypropylene, successful impact strength and flexural strength could not be obtained. However, when mixing the surface-modified CM with 1% silane by weight, a drastic increase in both the impact strength and flexural strength were obtained.
Keywords:Fly ash;Flotation;Rubber weight-adding material;Plastic filling material
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