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HWAHAK KONGHAK,
Vol.38, No.3, 398-404, 2000
Vol.38, No.3, 398-404, 2000
회분과 반회분 공정에 의해 생성된 실리카 미립자의 특성 비교
Comparison of the Properties of Silica Fine Particles Prepared by Using Batch and Semibatch Process
본 연구는 기존의 회분식 반응을 통한 실리카 미립자 제조시 발생되는 단분산도, 입경, 그리고 수율 등에서의 제어가 용이하지 못한 한계성을 극복하기 위하여 반회분식 공정을 이용, TEOS(Tetraethylorthosilicate)의 가수분해로부터 실리카 미립자를 제조하였다. 실험에 앞서 실리카 미립자의 가수분해 반응과 중합 반응에 대한 TEOS, Si(OH)4, SiO2의 반응속도식을 회분과 반회분식 공정에 대하여 각각 무차원화함으로써 시간에 따른 성분의 농도 변화 및 수율을 상호 비교할 수 있었으며 또한, 실험을 통하여 단분산도와 입경을 예측, 비교할 수 있었다. 실험결과, 반회분식 반응에 의한 경우가 회분식 반응에 의한 것보다 단분산도, 입경 그리고 수율 등에서 양호한 결과를 나타내었고, 이 결과는 반응속도식으로부터 예측한 결과와 잘 일치하였다.
Silica fine particles were synthesized from the hydrolysis of Si(OC2H5)4 by using a semibatch process in order to overcome difficulties in production of fine particles by a batchwise reaction. To predict the particle size distribution, mean particle size and the yield of silica fine particles prepared by using a semibatch and a batch process, in this work, nondimensional reaction rate equations for TEOS, Si(OH)4 and SiO2 of each system were suggested. The change of the concentration with time and the yield, therefore, were compared, respectively. As a result of the test, silica fine particles obtained by semibatch process were better than those prepared from batch system in particle size distribution, yield and mean particle size. Especially, it was found that semibatch process was a successful method for controling the size, i.e., a narrow distribution of a particle size which ranges to several microns. Also the theoretical results for the yield were in good agreement with the experimental data.
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