Korean Chemical Engineering Research, Vol.60, No.4, 594-605, November, 2022
굴 패각의 소성 조건에 따른 소석회의 특성과 외부용 수성 도료 적용 연구
A Study on the Characteristics of Ca(OH)2 According to the Calcination Conditions of Oyster Shells and Its Application for Exterior Water Paints
초록
마이크로웨이브 소성로를 이용하여 굴 패각을 소성하여 CaO 제조하였다. 제조된 CaO를 수화 반응시켜서 Ca(OH)2를 분석하였다. 합성한 Ca(OH)2를 주성분으로하여 외부용 수성 도료 배합하였다. 굴 패각(325 mesh, 43 μm)은 (a) 950℃ /1 시간와 (b) 1,150℃/1 시간 동안 탈탄산화반응을 시켜 CaO를 제조하였다. (a)의 소성 조건에서는 CaO 56.7 wt%이고 (b)의 소성 조건에서는 CaO 100 wt%였다. 굴 패각의 소성에 의한 CaO를 석회석의 경우와 비교하기 위하여 석회석(25~30 mm)을 950℃/1시간 동안 탈탄산화 반응시켜서 CaO를 제조하였으며, XRD 분석 결과 CaO 100 wt%로 분석 되었다. 굴 패각의 소성 조건인 (b) 1,150℃, 1시간으로 CaO를 제조하여 수화 반응을 통하여 Ca(OH)2를 합성하였다. 제조된 CaO의 수화 조건은 (a) CaO : H2O(100 g : 200 g)과 (b) CaO : H2O(100 g : 400 g)로 수화 반응성을 실시 하였다. 수화 반응 결과, 저 반응성으로 확인되었다. 100 wt%의 Ca(OH)2를 합성하였다. 특히 (a)의 수화 조건에서 합성한 Ca(OH)2는 판상형으로 분석되었다. 굴 패각으로 합성한 Ca(OH)2를 주성분으로 외부용 수성 도료를 배합하였다. 외부용 수성 도료 표준 규격(KS M 6010)의 15개 항목에 대하여 분석하였을 때 냉동안정성을 제외한 다른 모든 기준에 적합한 것을 확인하였다.
CaO was prepared by calcining for oyster shells using a microwave kiln. It was analyzed to Ca(OH)2 synthed on hydration reaction from prepared CaO. The synthesized Ca(OH)2 was formulated as an external water paint. Oyster shells (325 mesh, 43 μm) were decarbonized for (a) 950℃/1 hr and (b) 1,150℃/1 hr to prepare CaO. In the calcination condition of (a), CaO was 56.7 wt%, and in the calcination condition of (b), CaO was 100 wt%. To compare CaO by calcination of oyster shells with that of limestone, limestone (25~30 mm) was decarbonized at 950℃/1 hr to prepare CaO, and as a result of the analysis(XRD), it was analyzed as CaO 100 wt%. CaO was prepared under the calcining conditions of oyster shells (b) 1,150℃/1 hr, and Ca(OH)2 was synthesized through hydration. Hydration conditions of the prepared CaO were (a) CaO : H2O(100 g : 200 g) and (b) CaO : H2O(100 g : 400 g). As a result of the hydration reaction, it was confirmed as low reactivity. 100 wt% of Ca(OH)2 was synthesized. In particular, Ca(OH)2 synthesized under the hydration condition of (a) was analyzed in a plate shape. An external water paint was formulated with Ca(OH)2 synthesized from oyster shells as the main component. When 15 items of the external water paint standard specification (KS M 6010) were analyzed, it was confirmed that all other criteria were satisfied except for freezing stability.