국산벤토나이트 현탁액의 유동학적 성질

• 영문명: Rheological Studies on the Aqueous Suspension of Korean Bentonite
• 발행기관: 대한약학회
• 저자명: 김은희(Eun Hee Kim) 이계주(Gyr Ju Rhee)
• 간행물 정보: 『약학회지』제34권 제4호 (1990년), 302~310쪽, 전체 9쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 1990.08.28

영문 초록

A study has been made of the Korean bentonite aqueous suspension contrast with American bentonite by means of XRDIR swelling, gel formation and rheogram at various conditions such as concentration, temperature and pH. The Korean bentonite was identified as montmorillonite clay containig a small proprotion of crystoballite and mordenite. and its swelling power were acceptable for requirements of Korean pharmacopeia regulations though its values were not satisfied. Korean bentonite swelled to 10 times and American one did to 15 times compared to its bulkiness of powder. The rheogram of Korean bentonite suspension reveals bulged pseudoplatic flow with yield value at higher concentration and pseudoplastic flow without yield value at lower concentration. The higher the concentration, the greater were the apparent viscosity and hysteresis loop. Korean bentonite suspension showed insignificant temperature dependence on both apparent viscosity, and hysteresis loop and it was more temperature dependent on viscosity but less on hysteresis loop than those of American sample. The pH dependence was so high on viscosity that apparent minimum value was near pH 7 and maximum value at pH 3 or 7. The hysteresis loop appeared minimum over the pH range 5-7 and maximum near pH 3 or 11.The Korean bentonite was inferior to the American bentonite in swelling Volume, gel formation, thioxotropy, however, it would be possible to improve the quality of Korean bentonite by developing the method of purification for bentonite clay.

키워드

Thixotropy rheogram hysteresis loop pseudo plastic flow bentonite