HWAHAK KONGHAK, Vol.37, No.3, 465-471, June, 1999
폴리에틸렌/실리카/미네랄 오일을 이용한 미세다공성 격리막의 제조
Preparation of Microporous Separator with Polyethylene/Silica/Mineral Oil
초록
격리막은 고분자(UHMWPE, HDPE), process oil(mineral oil), 실리카, carbon black 및 BHT의 입자혼합물로 구성되며 PR(polymer g/process oil g)의 비율에 따라 process oil이 추출된 격리막과 process oil 및 실리카가 추출된 2 종류의 격리막을 제조하여 물성을 측정하였다. 비극성 유기용매로 추출한 경우 거의 98%의 process oil이 추출되었으며 실리카의 추출은 수산화나트륨 용액에서 30분 정도가 경과하면서 완만한 무게 감소율을 보였다. 내산화성 시험에서는 process oil의 양이 감소함에 따라 거의 1 % 미만의 질량 감량률을 나타내었다. 인장강도의 경우, 두 시험편 모두 PR이 증가함에 따라 기계적인 강도가 증가함을 보이고 있는 반면 전해전기저항 시험에서는 process oil과 실리카의 함량이 증가할수록 격리막 시험편의 저항값이 낮아지는 경향을 보였다. 질소 흡-탈착법에서 두 시험편의 경우 process oil의 함량이 증가할수록 비표면적이 증가함을 보였으며 모세관 응축을 나타내는 hysteresis현상을 나타냈다. 또한, SEM의 분석 결과에서는 process oil의 함량이 증가할수록 미세세공이 잘 분포되어 있음을 확인할 수 있었다.
A separator was composed of the particle mixtures wish polymer(UHMWPE, HDPE), process oil(mineral oil), silica carbon black and BHT. Two kinds of separators extracted process oil, and process oil and silica with PR(polymer g/process oil g) were prepared, and then their properties were investigated. The specimen which was extracted by nonpolyar organic solvents extracted process oil of nearly 98%. The extracted amount of silica showed slowly the weight loss of specimens with the lapse of 30 min in sodium hydroxide solution. The resistance of specimens against sulfuric acid showed the weight loss of specimens of nearly less than 1 % with the increase of PR(polymer g/process oil g) ratio. As the PR ratio was increased, the tensile strength was increased but the electrical resistance of specimens showed the high resistance value. The isotherm by N2 gas adsorption-desorption method exposed the increase of the surface area with the increment of process oil having hysteresis regions of capillary condensation. In the result of SEM analysis, the micropores within PE layers was well distributed as the amount of process oil was increased.
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