METHOD FOR PREPARING SILVER POWDER HAVING INCREASED SPECIFIC SURFACE AREA

• Main Authors: KWON, Tae Hyeon, LEE, Chang Gun, CHOI, Jae Won, JIN, Woo Min, LEE, Mi Young, KANG, Tae Hoon
• Format: Patent
• Language: English; French; Korean
• Published: 08.03.2018
• Subjects: CASTING; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; WORKING METALLIC POWDER

The present invention relates to a method for preparing a silver powder, comprising: a silver salt solution preparation step (S1) of preparing a silver salt solution by adding a silver nitrate solution, nitric acid, and ammonia water to a solvent and mixing the same; a reducing solution preparation step (S2) of preparing a reducing solution by mixing and adding hydraquinone and ascorbic acid to a solvent; and a reduction reaction step (S3) of precipitating silver particles by mixing the silver salt solution and the reducing solution. Provided is a method for preparing, without using other equipment, a silver powder having an increased specific surface area, while maintaining the spherical shape of the silver powder. La présente invention porte sur un procédé de préparation d'une poudre d'argent, comprenant : une étape de préparation de solution de sel d'argent (S1) consistant en la préparation d'une solution de sel d'argent par ajout d'une solution de nitrate d'argent, d'acide nitrique et d'eau ammoniacale à un solvant et en leur mélange ; une étape de préparation de solution de réduction (S2) consistant en la préparation d'une solution de réduction par mélange et ajout d'hydraquinone et d'acide ascorbique à un solvant ; et une étape de réaction de réduction (S3) consistant en la précipitation de particules d'argent par mélange de la solution de sel d'argent et de la solution de réduction. L'invention concerne un procédé de préparation, sans utiliser d'autre équipement, d'une poudre d'argent disposant d'une surface spécifique accrue, tout en maintenant la forme sphérique de la poudre d'argent. 본 발명은 용매에 질산은 용액, 질산 및 암모니아수를 첨가 및 혼합하여 은 염 용액을 제조하는 은 염 용액 제조단계(S1), 용매에 하이드라퀴논 및 아스코르브산을 혼합하여 첨가하여 환원 용액을 제조하는 환원 용액 제조단계(S2) 및 상기 은 염 용액 및 상기 환원 용액을 혼합하여 은 입자를 석출하는 환원 반응단계(S3)를 포함하는 은 분말 제조방법에 관한 것으로, 은 분말의 형상이 구형을 유지하면서도 기타 장비의 사용 없이 비표면적이 증가된 은 분말을 제조하는 방법을 제공할 수 있다.