The surface of inorganic pigments was modified as an alternative method to provide a competitive edge for the nation`s paper industries. The particle sizes of inorganic pigments for paper applications such as clay, talc, CaCO_3, and TiO_2 were measured. The selected core particles and fine particles were then mixed at a calculated ratio. When the sample was electrified the fine particles adhered to the larger ones due to the static electricity. These powders were then modified by the impact force resulting from a very high-speed air circulation. During the surface modifying of pigments, the energy change caused by the fine powder adhering to the core powder was measured and utilized in examining the efficiency of the surface modification due to the change in particle size. The change of optical properties of pigment during the surface modification was confirmed by measuring the brightness and scattering rate of surface modified pigments and mixed pigments. After putting these surface modified pigments in water, their static electricity properties were measured with a particle charge detector and a zeta potential tester. From these results, it was revealed that some of the basic powder properties of paper-making inorganic pigment were improved.

제지산업에 경쟁력을 부여찰 수 있는 방법의 일환으로 제지용 무기안료외 표면을 개질처리하였다. 재지용 무기안료인 clay, talc, CaCO_3, TiO_2의 입도를 측정한 뒤, 선택된 모입자(clay,talc, CaCO_3)와 자입자(TiO_2)를 계산식에 의한 배합비로 혼합하였, 분체의 대전현상을 이용하여 모입자 주위에 자입자를 부착시킨 다음 고속기류 중 충격력으로 개질처러하였다. 표면개질시 자입자가 모입자에 흡착될 때의 에너지를 측정하여 입도 변화에 따른 표면개질 효율성을 측정하였다. 표면개질안료와 혼합안료의 백색도, 산란도 등을 측정하여 표면개질처리시 안료외 광학적 성질변화를 확인하였다. 그리고 표면개질된 안료를 액상에 투입하고, 입자전하측정기와 재타전위측정기를 이용하여 정전기적 성질변화를 측정하였다. 본 연구의 결과로부터, 표면개짙처리된 제지용 무기안료의 기본적인 분체물성이 개선되었음을 알 수 있었다.