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Ziegler-Natta 촉매를 이용한 선형저밀도 폴리에틸렌의 제조
李東鎬,민경은,金次雄 경북대학교 공과대학 1984 工大硏究誌 Vol.13 No.-
For the preparation of linear low-density polyethylene (LLDPE), the copolymerization of ethylene and 1-butene has been carried out with various Ziegler-Natta catalysts in slurry phase. The effects of catalyst components, concentration of catalyst components, polymerization time on the yields and compositions of copolymer have been examined. Furthermore the density and thermal properties of obtained copolymer have been measured for the correlation to the 1-butene contents. It has been found that the titanium tetra n-butoxide-diethyl aluminum chloride cata-lyst system was the most suitable for yield and 1-butene content of copolymer. The yield of copolymer was increased with the concentrations of two catalyst components but the 1-butene content did not show any tendency for catalyst concentration. The diluent of aliphatic hydrocarbon showed better results than other diluents. The density of copolymer was decreased with the increase of 1-butene content. The melting point and heat of fusion of copolymer were decreased with 1-butene content.
Linear Low Density Polyethylene Preparation by Titanium-Based Ziegler-Natta Catalysts
이동호,민경은,김차웅,Dong-Ho Lee,Kyung-Eun Min,Cha-Ung Kim Korean Chemical Society 1987 대한화학회지 Vol.31 No.1
선형저밀도폴리에틸렌(LLDPE)의 제조를 위해 여러가지 티탄알콕시드-알킬알루미늄 화합물을 촉매로 하여 에틸렌과 1-부텐을 슬러리 상태로 공중합하였다. 이때 촉매성분의 종류 및 농도, 숙성시간, 중합시간과 중합온도 등이 촉매활성과 공중합체 조성에 미치는 영향을 연구하였다. 그리고 공중합체의 성질과 1-부텐 함량과의 관계를 조사하였다. 그 결과 티탄사노르말부톡시드-염화디에틸알류미늄의 촉매를 사용하였을 때 가장 큰 촉매활성, 보다 많은 1-부텐 함량 및 가장 작은 가용성 부분의 LLDPE를 얻을 수 있었다. 얻은 공중합체의 밀도, 유리전이온도, 녹는점 및 녹음열 등은 1-부텐의 함량이 증가함에 따라 감소하였다. For the preparation of linear low density polyethylene (LLDPE), the copolymerization of ethylene and 1-butene was carried out with various catalysts of titanium alkoxidealkylaluminum compound in slurry phase. The effects of catalyst components, aging time, concentration of catalyst components, polymerization time and temperature on the catalytic activity and copolymer composition were examined. The properties of copolymer obtained were also considered with the correlation to the 1-butene contents. It has been found that the titanium tetra-n-butoxide-diethylaluminum chloride catalyst system was the most suitable for the production of LLDPE with higher catalytic activity, more 1-butene content and less soluble parts. The density, glass transition temperature, melting point and heat of fusion of copolymer were decreased with increasing 1-butene contents.