KR20100100210A - Preparation method of silver powder by using sodium hypophosphite - Google Patents

Preparation method of silver powder by using sodium hypophosphite Download PDF

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KR20100100210A
KR20100100210A KR1020090018964A KR20090018964A KR20100100210A KR 20100100210 A KR20100100210 A KR 20100100210A KR 1020090018964 A KR1020090018964 A KR 1020090018964A KR 20090018964 A KR20090018964 A KR 20090018964A KR 20100100210 A KR20100100210 A KR 20100100210A
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silver
silver nitrate
silver powder
powder
sodium hypophosphite
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KR101215011B1 (en
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구기갑
김재경
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서강대학교산학협력단
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00Making metallic powder or suspensions thereof
    • B22F9/16Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/24Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2301/00Metallic composition of the powder or its coating
    • B22F2301/25Noble metals, i.e. Ag Au, Ir, Os, Pd, Pt, Rh, Ru
    • B22F2301/255Silver or gold

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Abstract

PURPOSE: A preparation method for silver powder is provided to reduce the reduction time and prepare silver powder at the room temperature by employing sodium hypophosphite as the reducing agent. CONSTITUTION: A preparation method for silver powder comprises steps of preparing silver powder precipitate through automatic reaction by adding NaOH and sodium hypophosphite in silver nitrate solution, and obtaining silver powder through filtering, washing, and drying of the silver powder precipitate. The silver nitrate solution comprises silver nitrate and distilled water at the weight ratio of 1:1~1:10. The weight ratio of silver nitrate and NaOH contained in the silver nitrate solution is 1:0.05~1:0.2. The weight ratio of silver nitrate and sodium hypophosphite contained in the silver nitrate solution is 1:0.3~1:3.

Description

차아인산나트륨을 이용한 은 분말 제조 방법{Preparation method of silver powder by using sodium hypophosphite}Preparation method of silver powder using sodium hypophosphite {Preparation method of silver powder by using sodium hypophosphite}

본 발명은 질산은을 차아인산나트륨으로 자동환원반응시킴으로써, 실온에서 착화제와 계면 활성제 및 유기용매의 사용없이 은 분말을 제조하는 방법에 관한 것이다.The present invention relates to a process for producing silver powder without the use of complexing agents, surfactants and organic solvents at room temperature by the automatic reduction of silver nitrate with sodium hypophosphite.

최근 첨단 산업기술의 발달에 따라 고기능성의 정밀소재에 대한 요구가 급증하게 되고, 이에 따라 강도, 경도, 내마모성, 중량 등을 개선하며 고도로 제어된 물리·화학적 특성을 제공할 수 있는 미립의 금속 원료분말이 요구되고 있다. 이러한 금속 원료 분말 중 은 분말은 전자산업의 후막집적회로, 프린트 배선회로, 열경화성 도전 페이스트 등 도전성 충전재(conductive filler), 다이아몬드 세라믹 분말, 텅스텐 카바이드, 텅스텐 분말, 니켈 분말, 게르마늄 분말 등과 혼합하여 소결 합금 제조에 이용된다. Recently, with the development of advanced industrial technology, the demand for high-performance precision materials is rapidly increasing. Accordingly, fine metal raw materials that can provide highly controlled physical and chemical properties while improving strength, hardness, wear resistance, weight, etc. Powder is required. Among these metal raw material powders, silver powder is mixed with conductive fillers such as thick film integrated circuit, printed wiring circuit, thermosetting conductive paste, diamond ceramic powder, tungsten carbide, tungsten powder, nickel powder, germanium powder, etc. It is used for manufacture.

은 분말을 제조하는 방법으로는 화학적 환원법, 물리적(기계적)인 방법으로 서 구별된다. 물리적인 방법으로는 에어로졸 분사에 의한 기상(화염) 분해법, 괴상 은괴의 분쇄법이 알려져 있지만 수율, 가혹한 제조 공정으로 인해서 많은 제약이 따르므로 비교적 빠른 환원 속도, 은 입자의 효율적인 회수로 인해서 화학적 환원법이 널리 이용되고 있다. 상기 화학적 환원법을 소개하면 아래와 같다.The silver powder is classified into chemical reduction and physical (mechanical) methods. As physical methods, gas phase (flame) decomposition by aerosol injection and pulverization of bulk silver are known. However, due to many limitations due to yield and harsh manufacturing process, the chemical reduction method is relatively effective due to relatively high reduction rate and efficient recovery of silver particles. It is widely used. The chemical reduction method is as follows.

대한민국 공개특허 제 10-2005-40226호는 질산 수용액에 은 덩어리를 용해시켜 질산은 수용액을 제조하고, 여기에 수산화암모늄을 첨가시켜서 은-암모늄 착이온을 형성한 후, 계면활성제 첨가 및 pH 조절을 거쳐 포름알데히드로서 환원시켜 은 입자 제조방법이 기재되어 있다. 대한민국 등록특허 제368055호는 질산은 수용액에 암모니아수를 첨가하여 pH 11로 조절하고 별도의 환원제 용액으로서 하이드로퀴논을 용해시킨 수용액을 제조한 후, 두 용액을 상온에서 혼합하여 구형 은 분말을 제조하는 방법이 기재되어 있다. 대한민국 공개특허번호 제10-2005-116544호는 질산은 수용액과 하이드로퀴논 및 아황산 칼륨(또는 아황산 암모늄)을 증류수에 용해시킨 용액을 혼합하여 반응시키고 암모니아수를 첨가하여 은 판상 입자를 제조하는 방법이 기재되어 있다. 대한민국 등록특허 제10-449369호는 에틸렌글리콜에 수산화암모늄을 첨가시키는 1 단계; 에틸렌글리콜과 수산화암모늄이 혼합된 용액에 질산은과 폴리비닐피롤리돈(polyvinylpyrrolidone, PVP)를 용해시키는 2 단계; 에틸렌글리콜에 과산화수소와 염화백금산(H2PtCl6)을 첨가하는 3 단계를 거쳐서 판상의 은 분말을 제조하는 방법이 기재되어 있다. 대한민국 공개특허 제10-12141호는 은괴를 진한질산에 침지시키고 온도를 70℃ ∼ 80℃로 유지하여 용해시킨 후, 염화 나트륨 수용액을 첨가하여 염화은을 제조하고 염산 수용액을 첨가하여 pH 4로 조절하였다. 그 후 이 용액에 철편이 부착된 교반기를 회전시켰을 때, 은 분말을 회수하는 방법이 기재되어 있다.Korean Patent Laid-Open Publication No. 10-2005-40226 dissolves a silver mass in an aqueous solution of nitric acid to prepare an aqueous solution of silver nitrate, and adds ammonium hydroxide thereto to form a silver-ammonium complex ion, followed by adding a surfactant and adjusting pH. A method for producing silver particles by reducing as formaldehyde is described. Republic of Korea Patent No. 368055 discloses a method of preparing spherical silver powder by mixing aqueous solution at room temperature after preparing an aqueous solution in which hydroquinone is dissolved by adding ammonia water to an aqueous solution of silver nitrate and adjusting to pH 11 as a separate reducing agent solution. It is described. Korean Patent Laid-Open No. 10-2005-116544 describes a method of preparing silver plate-shaped particles by reacting a solution of silver nitrate with a solution of hydroquinone and potassium sulfite (or ammonium sulfite) dissolved in distilled water and adding ammonia water. have. Korean Patent No. 10-449369 discloses a step of adding ammonium hydroxide to ethylene glycol; Dissolving silver nitrate and polyvinylpyrrolidone (PVP) in a solution in which ethylene glycol and ammonium hydroxide are mixed; A method for producing a plate-like silver powder is described through three steps of adding hydrogen peroxide and chloroplatinic acid (H 2 PtCl 6 ) to ethylene glycol. Korean Patent Laid-Open Publication No. 10-12141 is immersed in a concentrated nitric acid and dissolved by maintaining the temperature at 70 ℃ ~ 80 ℃, and then prepared by adding an aqueous sodium chloride solution and adjusted to pH 4 by adding an aqueous hydrochloric acid solution. . Then, the method of recovering silver powder is described when rotating the stirrer which iron piece adhered to this solution.

또한, 은 입자를 얻기 위하여, 착화제로서 트리소디움시트레이트(trisodium citrate)를, 환원제로서 NaBH4를 이용하여 4 nm 크기 은 분말을 회수하는 방법이 공지되어 있다. 그리고 은 나노 와이어(wire), 은 나노 막대(rod) 입자는 계면활성제로서 CTAB(cetyltrimethylammonium bromide), 환원제로서 아스코르빈산으로부터 제조되는 기술이 공지되어 있다(Chem.Commum., 617(2001)). 또한, Sinha 등은 글리세롤(glycerol)을 용매와 환원제로서 이용하였으며 은염 용액을 175℃까지 가열하여 1.5 ㎛ ~ 11 ㎛ 크기 은 입자를 제조하였다(Bull.Mater.Sci., 28(3), 213(2005)). Sondi 등은 질산은(5 중량%), 아스코르빈산(4.4 중량%), Daxad 19(naphthalene sulfonate formaldehyde condensate, M.W. 8000, 10 중량%)를 이용하여 평균 입경 14.7 nm ~ 26.3 nm 정도 은 입자를 제조하였는데, 이러한 은 입자 제조방법에서 환원시간은 1분 ~ 7분 범위이다(Journal of Colloid and Interface Science, 260, 75(2003)). Wang 등은 은염으로서 염화은, 환원제로서 글루코스(glucose)를 이용하여 환원시간 18 시간, 반응 온도 180℃ 조건에서 은 와이어(100 nm × 500 nm)를 제조하였다(Chem.Eur.J., 11, 160(2005)). In addition, in order to obtain silver particles, a method of recovering a 4 nm size silver powder using trisodium citrate as a complexing agent and NaBH 4 as a reducing agent is known. In addition, a technique is known in which silver nanowires and silver nanorod particles are prepared from cetyltrimethylammonium bromide (CTAB) as a surfactant and ascorbic acid as a reducing agent (Chem.Commum., 617 (2001)). In addition, Sinha et al. Used glycerol (glycerol) as a solvent and a reducing agent, and the silver salt solution was heated to 175 ℃ to prepare a silver particle size of 1.5 ㎛ ~ 11 ㎛ (Bull. Mater. Sci., 28 (3), 213 ( 2005)). Sondi et al. Produced silver particles with an average particle diameter of 14.7 nm to 26.3 nm using silver nitrate (5% by weight), ascorbic acid (4.4% by weight) and Daxad 19 (naphthalene sulfonate formaldehyde condensate, MW 8000, 10% by weight). In this method, the reduction time ranges from 1 minute to 7 minutes (Journal of Colloid and Interface Science, 260, 75 (2003)). Wang et al prepared silver wire (100 nm × 500 nm) at a reduction time of 18 hours and a reaction temperature of 180 ° C. using silver chloride as a silver salt and glucose as a reducing agent (Chem. Eur. J., 11, 160). (2005)).

앞서 설명한 상기 화학적 환원법은 주로 습식 환원에 의한 은 분말 제조방법으로서, 기존의 은 분말 제조 조건은 실온 이외의 조건인 50℃ ~ 175℃, 낮은 은 농도(< 5 중량%) 및 긴 환원시간(18 시간 ~ 24 시간)을 필요로 하는 문제가 있다. 따라서, 기존 은 분말의 제조방법은 생산성이 떨어지는 문제가 있는 바, 새로운 은 분말 제조방법에 대한 요구가 증대되고 있다.The above-described chemical reduction method is mainly a method for producing silver powder by wet reduction. Conventional silver powder production conditions are 50 ° C. to 175 ° C. other than room temperature, low silver concentration (<5 wt%) and long reduction time (18 Time ~ 24 hours). Therefore, the existing production method of the silver powder has a problem of low productivity, the demand for a new silver powder production method is increasing.

이에, 본 발명자들은 기존 은 분말의 제조방법의 문제점을 해결하고자 노력, 연구한 결과, 질산은과 환원제로서 차아인산나트륨을 이용하여 실온에서 짧은 시간에 착화제, 계면활성제 및 유기용매의 사용 없이도 높은 수율로 은 분말을 제조하는 방법을 발명하게 되었다. 즉, 본 발명은 생산성이 향상된 새로운 은 분말의 제조방법을 제공하는데 그 목적이 있다.Accordingly, the present inventors have tried to solve the problems of the conventional production method of silver powder, and as a result, using a silver nitrate and sodium hypophosphite as a reducing agent in a short time at room temperature without the use of complexing agents, surfactants and organic solvents, high yield Invented a method for producing silver powder. That is, an object of the present invention is to provide a method for producing a new silver powder with improved productivity.

상기 목적을 해결하기 위한 본 발명은 차아인산나트륨을 이용한 은 분말을 제조하는 방법에 관한 것으로서, 질산은 용액에 수산화나트륨 및 차아인산나트륨을 첨가한 후, 자동환원반응에 의해 은 분말 침전물을 제조하는 제 1 단계; 및 상기 은 분말 침전물을 여과, 수세 및 건조시켜 은 분말을 제조하는 제 2 단계;를 포함하는 것을 그 특징으로 한다.The present invention for solving the above object relates to a method for producing a silver powder using sodium hypophosphite, after the addition of sodium hydroxide and sodium hypophosphite to the silver nitrate solution, to prepare a silver powder precipitate by an automatic reduction reaction Stage 1; And a second step of preparing the silver powder by filtration, washing with water and drying the silver powder precipitate.

이러한 본 발명의 은 분말 제조방법은 기존의 은 분말 제조방법과는 달리 착화제 및 계면활성제를 사용하지 않으며, 기존에는 18 시간 ~ 24 시간 걸리던 환원시간이 수 분 이내로 대폭 단축시킬 수 있다. 또한, 150℃ 이상의 높은 환원온도가 필요한 기존 제조방법과는 달리 본 발명은 낮은 환원온도(10℃ ~ 35℃)를 갖기 때문에 실온에서 제조가 가능할 뿐만 아니라, 은 분말의 높은 수율을 갖기 때문에 생산성이 매우 높다. The silver powder manufacturing method of the present invention does not use a complexing agent and a surfactant unlike the conventional silver powder manufacturing method, and the reduction time, which was previously 18 hours to 24 hours, can be significantly shortened to several minutes. In addition, unlike the existing manufacturing method that requires a high reduction temperature of 150 ℃ or more, the present invention has a low reduction temperature (10 ℃ ~ 35 ℃) not only can be manufactured at room temperature, but also has a high yield of silver powder productivity Very high.

앞서 설명한 본 발명을 보다 구체적으로 설명하면 다음과 같다. Referring to the present invention described above in more detail as follows.

본 발명은 차아인산나트륨을 이용한 은 분말을 제조하는 방법에 관한 것으로서, 질산은 용액에 수산화나트륨 및 차아인산나트륨을 첨가하여, 자동환원반응에 의한 은(Ag) 분말 침전물을 제조하는 제 1 단계; 및 상기 은 분말 침전물을 여과, 수세 및 건조시켜 은 분말을 제조하는 제 2 단계; 를 포함하는 것을 특징으로 한다.The present invention relates to a method for producing a silver powder using sodium hypophosphite, the first step of preparing a silver (Ag) powder precipitate by an automatic reduction reaction by adding sodium hydroxide and sodium hypophosphite to the silver nitrate solution; And a second step of filtering, washing, and drying the silver powder precipitate to prepare silver powder. Characterized in that it comprises a.

상기 각 단계는 실온인 10 ~ 35℃에서 수행하는 바, 종래 기술에서 요구되는 고온 환원(150℃ 이상)과 긴 환원 시간(18 시간 ~ 24 시간 이내)이 요구되지 않는데 특징이 있다.Each of the above steps is performed at a room temperature of 10 to 35 ℃, it is characterized by the high temperature reduction (150 ℃ or more) and long reduction time (within 18 hours to 24 hours) required in the prior art is not required.

본 발명에 있어서, 상기 질산은 용액은 질산은을 증류수에 용해시킨 수용액이다. 증류수와 질산은의 중량비는 실온 범위의 온도인 10 ~ 30℃에서 증류수에 대한 질산은의 용해도로부터 결정되는데, 증류수 1 g에 대한 질산은의 용해도는 1.5 g ~ 2.5 g 정도이다. 그러므로 상기 질산은 수용액에서 질산은과 증류수를 1 : 1 ~ 1 : 10 중량비로, 더욱 바람직하게는 1 : 2.5 ~ 6 중량비로 함유하고 있는 것이 좋다. 이때, 상기 질산은과 증류수의 중량비가 1 : 10 중량비를 초과하면, 은 분말 생성속도가 느려지게 되며, 상기 질산은과 증류수의 중량비가 1 : 1 미만이면, 불용된 질산은 때문에 금속 은 입자의 생성을 위한 과포화도 형성에 필요한 용질의 확산 과정이 불안정하게 되어 최종 생성된 입도 분포가 넓어질 수 있으므로 상기 범위 내의 중량비를 갖는 것이 좋다.In the present invention, the silver nitrate solution is an aqueous solution in which silver nitrate is dissolved in distilled water. The weight ratio of distilled water and silver nitrate is determined from the solubility of silver nitrate in distilled water at a temperature in the range of 10 to 30 ° C. The solubility of silver nitrate in 1 g of distilled water is about 1.5 g to 2.5 g. Therefore, the silver nitrate solution may contain silver nitrate and distilled water in a weight ratio of 1: 1 to 1:10, more preferably 1: 2.5 to 6 weight. At this time, when the weight ratio of the silver nitrate and distilled water exceeds 1:10 weight ratio, the silver powder production rate is slowed, and when the weight ratio of the silver nitrate and distilled water is less than 1: 1, due to the insoluble silver nitrate for the production of metal silver particles It is preferable to have a weight ratio within the above range since the diffusion process of the solute necessary for supersaturation formation may become unstable and the final particle size distribution may be widened.

상기 수산화나트륨은 은 이온의 환원 퍼텐셜을 낮추는 역할을 수행하는데, 상기 질산은 수용액에서 질산은과 상기 수산화나트륨의 중량비는 1 : 0.05 ~ 1 : 0.2, 더욱 바람직하게는 1 : 0.1 ~ 1 : 0.2 중량비인 것이 적절한데, 상기 수산화나트륨이 0.2 중량비를 초과하는 경우, 용액의 pH가 높아지기 때문에 산화은이 침전되는 문제점이 나타날 수 있고, 0.05 중량비 미만으로 사용 시 환원반응시간이 길어질 수 있으므로 상기 범위 내에서 사용하는 것이 좋다. The sodium hydroxide serves to lower the reduction potential of silver ions, the weight ratio of silver nitrate and sodium hydroxide in the silver nitrate aqueous solution is 1: 0.05 to 1: 0.2, more preferably 1: 0.1 to 1: 0.2 weight ratio. When the sodium hydroxide is more than 0.2 weight ratio, the pH of the solution is high, the silver oxide may precipitate, and when using less than 0.05 weight ratio, the reduction reaction time may be long, so use within the above range good.

상기 차아인산나트륨은 은(Ag) 이온의 자동환원반응을 위한 환원제로서, 상기 질산은 수용액에서 질산은과 상기 차아인산나트륨은 1 : 0.3 ~ 1 : 3, 더욱 바람직하게는 1 : 0.4 ~1 : 2.5 중량비인 것이 좋다. 이때, 상기 범위를 벗어나게 될 경우, 환원 반응이 진행되지 않거나 과잉 환원 반응으로 인해서 격렬하게 용액의 온도가 높아지는 문제점이 있기 때문에 상기 범위를 유지하는 것이 좋다. The sodium hypophosphite is a reducing agent for the automatic reduction of silver (Ag) ions, the silver nitrate and the sodium hypophosphite in the silver nitrate aqueous solution is 1: 0.3 ~ 1: 3, more preferably 1: 0.4 ~ 1: 2.5 weight ratio It is good to be At this time, if the range is out of the range, it is preferable to maintain the range because the reduction reaction does not proceed or the temperature of the solution is increased violently due to the excessive reduction reaction.

상기 차아인산 나트륨과 수산화나트륨을 가한 후, 자동환원반응을 통하여 약간 회색빛이 도는 흰색의 은 분말 침전물이 생성되며, 생성된 은 분말 침전물은 당 업계에서 사용되는 일반적인 방법으로 여과 및 수세한 후, 건조시켜서 높은 수율로 서 회수된다.After addition of the sodium hypophosphite and sodium hydroxide, a silvery white precipitate is produced through an automatic reduction reaction, and the silver powder precipitate is filtered and washed by a general method used in the art. It is dried and recovered in high yield.

이상에서 설명한 본 발명을 다음의 실시예에 의거하여 더욱 상세히 설명하겠으나, 본 발명의 권리범위가 다음의 실시예에 의해 한정되는 것은 아니다.The present invention described above will be described in more detail based on the following examples, but the scope of the present invention is not limited to the following examples.

실시예 1 Example 1

25℃에서 질산은 분말 16.7 g을 증류수 52 g에 용해시켜 투명한 질산은 수용액이 얻은 후, 상기 질산은 수용액에 수산화나트륨 3.13 g와 차아인산나트륨 36.13 g가 가하여 자동환원반응을 유도하여 약한 회색의 은 분말 침전물을 얻었다. 그 후, 상기 은 분말 침전물을 여과, 세수 및 건조시켜서, 9.831 g의 은 분말을 얻었다(수율 : 92.7%, 환원 시간 : 4분 43초). 도 1은 제조된 은 분말의 X선 회절도를 나타내었다. After dissolving 16.7 g of silver nitrate powder in 52 g of distilled water at 25 ° C. to obtain a transparent silver nitrate solution, 3.13 g of sodium hydroxide and 36.13 g of sodium hypophosphite were added to the silver nitrate solution to induce an automatic reduction reaction to obtain a weak gray silver powder precipitate. Got it. Thereafter, the silver powder precipitate was filtered, washed with water and dried to obtain 9.831 g of silver powder (yield: 92.7%, reduction time: 4 minutes 43 seconds). 1 shows the X-ray diffraction diagram of the prepared silver powder.

실시예 2 Example 2

25℃에서 질산은 분말 0.15 g를 증류수 0.786 g에 용해시켜 투명한 질산은 수용액이 얻은 후, 상기 질산은 수용액에 수산화나트륨 0.027 g와 차아인산나트륨 0.32 g를 가하여 약한 회색빛이 도는 흰색의 은 분말이 침전물을 얻었다. 그 후, 상기 은 분말 침전물을 여과, 세수 및 건조시켜서 0.0912 g의 은 분말을 얻었다(수율 : 96%, 환원 시간 : 3분 31초).0.15 g of silver nitrate powder was dissolved in 0.786 g of distilled water at 25 ° C. to obtain a transparent silver nitrate solution. Then, 0.027 g of sodium hydroxide and 0.32 g of sodium hypophosphite were added to the silver nitrate solution to obtain a light grayish silver powder. . Thereafter, the silver powder precipitate was filtered, washed with water and dried to obtain 0.0912 g of silver powder (yield: 96%, reduction time: 3 minutes 31 seconds).

실시예 3Example 3

25℃에서 질산은 분말 0.15 g를 증류수 0.75 g에 용해시켜 투명한 질산은 수용액이 얻은 후, 상기 질산은 수용액에 수산화나트륨 0.023 g와 차아인산나트륨 0.15 g를 가하여 약한 회색빛이 도는 흰색의 은 분말이 침전물을 얻었다. 그 후, 상기 은 분말 침전물을 여과, 세수 및 건조시켜서 0.0881 g의 은 분말을 얻었다(수율 : 94%, 환원 시간 : 3분 10초).After dissolving 0.15 g of silver nitrate powder in 0.75 g of distilled water at 25 ° C. to obtain a transparent silver nitrate solution, 0.023 g of sodium hydroxide and 0.15 g of sodium hypophosphite were added to the silver nitrate solution to obtain a light grayish silver powder. . Thereafter, the silver powder precipitate was filtered, washed with water and dried to obtain 0.0881 g of silver powder (yield: 94%, reduction time: 3 minutes 10 seconds).

비교예 1Comparative Example 1

상기 실시예 2와 동일하게 실시하되, 수산화나트륨은 첨가되지 않았다. 차아인산 나트륨이 가해졌을 때, 은 분말이 침전물로 회수되었다. 그 후, 상기 은 분말 침전물을 여과, 세수 및 건조시켜서 0.08g의 은 분말을 얻었다(수율 : 84%, 환원 시간 : 72분 34초).The same procedure as in Example 2, except that sodium hydroxide was not added. When sodium hypophosphite was added, silver powder was recovered as a precipitate. Thereafter, the silver powder precipitate was filtered, washed with water and dried to obtain 0.08 g of silver powder (yield: 84%, reduction time: 72 minutes 34 seconds).

본 발명이 제시하는 방법으로 제조된 은 분말은 수분산 폴리우레탄, 수분산 아크릴 등의 수용성 고분자 기질에 분산되며 항균, 살균성, 대전 방지성, 전자파 차단성, 방충성, 감광성, 탈취성을 갖는 필름제조 등에 폭 넓게 이용될 것으로 기대된다.The silver powder prepared by the method of the present invention is dispersed in a water-soluble polymer substrate such as water-dispersed polyurethane and water-dispersed acrylic, and has an antimicrobial, bactericidal, antistatic, electromagnetic wave blocking, insect repellent, photosensitive, and deodorizing film. It is expected to be widely used for manufacturing.

도 1은 본 발명에 따라 실시예 1에서 제시된 은 분말의 X선 회절곡선을 나타낸 것이다.Figure 1 shows the X-ray diffraction curve of the silver powder presented in Example 1 according to the present invention.

도 2는 질산은 수용액에 수산화나트륨을 가했을 때 얻어진 산화은의 X선 회절곡선을 나타낸 것이다.Fig. 2 shows the X-ray diffraction curve of silver oxide obtained when sodium hydroxide is added to an aqueous solution of silver nitrate.

Claims (5)

질산은 용액에 수산화나트륨 및 차아인산나트륨을 첨가하여, 자동환원반응에 의한 은 분말 침전물을 제조하는 제 1 단계; 및 Adding a sodium hydroxide and sodium hypophosphite to the silver nitrate solution to prepare a silver powder precipitate by an autoreduction reaction; And 상기 은 분말 침전물을 여과, 수세 및 건조시켜 은 분말을 제조하는 제 2 단계;Filtering, washing, and drying the silver powder precipitate to prepare a silver powder; 를 포함하는 것을 특징으로 하는 차아인산나트륨에 의한 은 분말의 제조방법.Method for producing a silver powder with sodium hypophosphite, characterized in that it comprises a. 제 1 항에 있어서, 상기 질산은 용액은 질산은과 증류수를 1 : 1 ~ 1 : 10 중량비로 포함하고 있는 것을 특징으로 하는 은 분말의 제조방법.The method of claim 1, wherein the silver nitrate solution comprises silver nitrate and distilled water in a weight ratio of 1: 1 to 1:10. 제 1 항에 있어서, 상기 질산은 용액에 함유된 질산은과 상기 수산화나트륨은 1 : 0.05 ~ 1 : 0.2의 중량비를 갖는 것을 특징으로 하는 은 분말의 제조방법.The method of claim 1, wherein the silver nitrate and the sodium hydroxide contained in the silver nitrate solution have a weight ratio of 1: 0.05 to 1: 0.2. 제 1 항에 있어서, 상기 질산은 용액에 함유된 질산은과 상기 차아인산나트륨은 1 : 0.3 ~ 1 : 3의 중량비를 갖는 것을 특징으로 하는 은 분말의 제조방법.The method of claim 1, wherein the silver nitrate and the sodium hypophosphite contained in the silver nitrate solution have a weight ratio of 1: 0.3 to 1: 3. 제 1 항에 있어서, 상기 각 단계는 10 ~ 35℃ 온도 하에서 수행하는 것을 특징으로 하는 은 분말의 제조방법.The method of claim 1, wherein each of the steps is performed at a temperature of 10 ° C. to 35 ° C. 6.
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WO2017026723A1 (en) * 2015-08-12 2017-02-16 엘에스니꼬동제련 주식회사 Silver powder and preparing method therefor
KR102023711B1 (en) * 2019-05-02 2019-11-04 파워팩 주식회사 A silver nano powder of high purity
CN115570146A (en) * 2022-10-26 2023-01-06 陕西煤业化工技术研究院有限责任公司 Self-dispersion nano-scale silver powder and preparation method thereof

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KR100473478B1 (en) 2002-11-20 2005-03-11 (주)나눅스 Silver colloid and preparation method thereof
JP2007224422A (en) * 2007-03-12 2007-09-06 Dowa Holdings Co Ltd Silver powder and paste using the same
KR100890631B1 (en) 2007-08-24 2009-03-27 서강대학교산학협력단 Preparation of silver powder by using the insoluble silver salts

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017026723A1 (en) * 2015-08-12 2017-02-16 엘에스니꼬동제련 주식회사 Silver powder and preparing method therefor
KR102023711B1 (en) * 2019-05-02 2019-11-04 파워팩 주식회사 A silver nano powder of high purity
CN115570146A (en) * 2022-10-26 2023-01-06 陕西煤业化工技术研究院有限责任公司 Self-dispersion nano-scale silver powder and preparation method thereof
CN115570146B (en) * 2022-10-26 2023-10-20 陕西煤业化工技术研究院有限责任公司 Self-dispersion nanoscale silver powder and preparation method thereof

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