CN105149575A - Preparation method of silver coated copper powder - Google Patents
Preparation method of silver coated copper powder Download PDFInfo
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- CN105149575A CN105149575A CN201510695236.6A CN201510695236A CN105149575A CN 105149575 A CN105149575 A CN 105149575A CN 201510695236 A CN201510695236 A CN 201510695236A CN 105149575 A CN105149575 A CN 105149575A
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- copper powder
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Abstract
The invention discloses a preparation method of silver coated copper powder. According to the preparation method, silver coated copper powder can be prepared only by adding copper powder to a silver nitrate solution according to a certain weight ratio and pumping the mixture into a grinding device to be ground in a circulation mode for 20-50 minutes. The solid-liquid mixture of copper powder and the silver nitrate solution has a chemical reaction in the grinding process, part of copper powder has a replacement reaction with the silver nitrate solution so that silver ions can be replaced out to generate silver powder, the generated silver powder deposits on the surfaces of copper powder particles, more silver powder deposits on the surfaces of copper powder under the grinding acting force due to the fact that the solid-liquid mixture bears the grinding acting force of the grinding device in the grinding process, silver layers formed on the surfaces of the copper powder particles under the grinding acting force can be more compact and good in coating performance, and therefore the electrical conductivity of the silver coated copper powder is greatly improved, the content of silver in the silver coated copper powder obtained through the method can reach 55% or higher, and the comprehensive performance of silver coated copper powder is greatly improved. The preparation method is suitable for being applied and popularized in the filed of electronic materials.
Description
Technical field
The present invention relates to field of electronic materials, especially a kind of preparation method of silver-coated copper powder.
Background technology
Silver is that in all metals, electric conductivity is best, and its electrical conductivity is 1.62 × 10
16qcm, also has good in oxidation resistance, steady performance.But it is expensive, shortage of resources, can only be applicable to some special occasions, is difficult to large-scale application.And the low price of copper, be only about 1/20 of silver, be widely used in the fields such as electrically-conducting paint, electrode material, catalyst.But the chemical property of superfine cupper powder is much more active than silver, is easily oxidized, at Surface Creation Cu20 and the CuO film of copper, and copper powder particle size is thinner, its specific area is larger, oxidation rate is also faster, and this brings great difficulty to the large-scale application of copper powder.Silver-coated copper powder is as the good high connductivity filler of one, made an addition in electric slurry, coating (paint), glue (adhesive), ink, polymer slip, plastics, rubber etc., can be made into the goods such as various conduction, electromagnetic shielding, be widely used in the fields such as the conduction of each industrial departments such as electronics, electromechanics, communication, printing, Aero-Space, weapons, electromagnetic shielding.As electronics, electrician, the conduction of communication product, electromagnetic shieldings such as computer, mobile phone, electromedical equipment, electronic instruments.
Current silver-coated copper powder usually adopts chemical method to prepare silver powder and is then wrapped in Copper Powder Surface and obtains, but the silver-coated copper powder silver content that this chemical method preparation method is made is lower, and silver coating compactness is low, poorly conductive and production cost is higher, efficiency is lower.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method of silver-coated copper powder, and the silver-coated copper powder silver content utilizing the method obtained is higher and silver layer compactness is good, good conductivity.
The technical solution adopted for the present invention to solve the technical problems is: the preparation method of this silver-coated copper powder, in saturated liquor argenti nitratis ophthalmicus, add copper powder obtain solidliquid mixture, the weight ratio of described liquor argenti nitratis ophthalmicus and copper powder is 1.5 ~ 3, and circular grinding in solidliquid mixture suction milling apparatus can be obtained silver-coated copper powder in 20 ~ 50 minutes.
Further, the weight ratio of described liquor argenti nitratis ophthalmicus and copper powder is 2.
Further, the particle diameter of described copper powder is 2 ~ 3 microns.
Further, in described solidliquid mixture suction milling apparatus, the time of circular grinding is 30 minutes.
Further, the temperature of described liquor argenti nitratis ophthalmicus is 20 DEG C.
Further, described milling apparatus is sand mill.
The invention has the beneficial effects as follows: copper powder only need join in liquor argenti nitratis ophthalmicus according to certain weight ratio by the preparation method of this silver-coated copper powder, then by circular grinding in its suction milling apparatus 20 ~ 50 minutes, chemical reaction is there is in the solidliquid mixture of copper powder and liquor argenti nitratis ophthalmicus in process of lapping, silver ion is cemented out generation silver powder by part copper powder and liquor argenti nitratis ophthalmicus generation displacement reaction, the silver powder generated is deposited on the surface of copper powder particle, because solidliquid mixture is also subject to the abrasive action power of milling apparatus in process of lapping simultaneously, under abrasive action power, more silver powder is deposited over the surface of copper powder, and the silver layer that copper powder particle surface is formed under abrasive action power can be finer and close, covering property is good, and then the electric conductivity of silver-coated copper powder also improves greatly, through verification experimental verification, in the silver-coated copper powder utilizing said method to obtain, silver content can reach more than 55%, substantially increase the combination property of silver-coated copper powder, thus reduce the consumption of silver-coated copper powder, reduce production cost, improve product benefit, simultaneously, silver powder deposition is carried out under abrasive action power, its deposition velocity is accelerated greatly, the preparation efficiency of silver-coated copper powder can be improved.
Detailed description of the invention
The preparation method of this silver-coated copper powder, in saturated liquor argenti nitratis ophthalmicus, add copper powder obtain solidliquid mixture, the weight ratio of described liquor argenti nitratis ophthalmicus and copper powder is 1.5 ~ 3, and circular grinding in solidliquid mixture suction milling apparatus can be obtained silver-coated copper powder in 20 ~ 50 minutes.Copper powder only need join in liquor argenti nitratis ophthalmicus according to certain weight ratio by the method, then by circular grinding in its suction milling apparatus 20 ~ 50 minutes, chemical reaction is there is in the solidliquid mixture of copper powder and liquor argenti nitratis ophthalmicus in process of lapping, silver ion is cemented out generation silver powder by part copper powder and liquor argenti nitratis ophthalmicus generation displacement reaction, the silver powder generated is deposited on the surface of copper powder particle, because solidliquid mixture is also subject to the abrasive action power of milling apparatus in process of lapping simultaneously, under abrasive action power, more silver powder is deposited over the surface of copper powder, and the silver layer that copper powder particle surface is formed under abrasive action power can be finer and close, covering property is good, and then the electric conductivity of silver-coated copper powder also improves greatly, through verification experimental verification, in the silver-coated copper powder utilizing said method to obtain, silver content can reach more than 55%, substantially increase the combination property of silver-coated copper powder, thus reduce the consumption of silver-coated copper powder, reduce production cost, improve product benefit, simultaneously, silver powder deposition is carried out under abrasive action power, its deposition velocity is accelerated greatly, the preparation efficiency of silver-coated copper powder can be improved.
In order to guarantee to displace all silver ions and at the enough silver powder of copper powder particle surface deposition, the weight ratio of described liquor argenti nitratis ophthalmicus and copper powder is 2.
In order to improve the content of silver in silver-coated copper powder to greatest extent, the particle diameter of described copper powder is 2 ~ 3 microns, and such copper powder particle has enough large relative surface area can deposit more silver powder.
In order to make displacement reaction more abundant, enable more silver powder be deposited on copper powder particle surface, in described solidliquid mixture suction milling apparatus, the time of circular grinding is preferably 30 minutes simultaneously.Further, the temperature of described Ag-containing solution is 20 DEG C.
Described milling apparatus can select existing various lapping device, and in order to ensure grinding effect, provide enough abrasive action power to solidliquid mixture, described milling apparatus is preferably sand mill simultaneously.
Embodiment
Be 20 DEG C by temperature, the weight flake copper that be saturated liquor argenti nitratis ophthalmicus and the 5kg particle diameter of 10kg is 2-3 micron forms solidliquid mixture after mixing, by the solidliquid mixture suction sand mill high-speed circulating grinding 30min formed after mixing, obtain silver content about 55% silver color silver-coated copper powder, D50=1-2 micron, conductance is 1.5 × 10-5 Ω cm.
Claims (6)
1. the preparation method of a silver-coated copper powder, it is characterized in that: in saturated liquor argenti nitratis ophthalmicus, add copper powder obtain solidliquid mixture, the weight ratio of described liquor argenti nitratis ophthalmicus and copper powder is 1.5 ~ 3, and circular grinding in solidliquid mixture suction milling apparatus can be obtained silver-coated copper powder in 20 ~ 50 minutes.
2. the preparation method of silver-coated copper powder as claimed in claim 1, is characterized in that: the weight ratio of described liquor argenti nitratis ophthalmicus and copper powder is 2.
3. the preparation method of silver-coated copper powder as claimed in claim 2, is characterized in that: the particle diameter of described copper powder is 2 ~ 3 microns.
4. the preparation method of silver-coated copper powder as claimed in claim 3, is characterized in that: in described solidliquid mixture suction milling apparatus, the time of circular grinding is 30 minutes.
5. the preparation method of silver-coated copper powder as claimed in claim 4, is characterized in that: the temperature of described liquor argenti nitratis ophthalmicus is 20 DEG C.
6. the preparation method of silver-coated copper powder as claimed in claim 5, is characterized in that: described milling apparatus is sand mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510695236.6A CN105149575A (en) | 2015-10-23 | 2015-10-23 | Preparation method of silver coated copper powder |
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| CN201510695236.6A CN105149575A (en) | 2015-10-23 | 2015-10-23 | Preparation method of silver coated copper powder |
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| CN105149575A true CN105149575A (en) | 2015-12-16 |
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| CN201510695236.6A Pending CN105149575A (en) | 2015-10-23 | 2015-10-23 | Preparation method of silver coated copper powder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128550A (en) * | 2016-08-30 | 2016-11-16 | 乐山新天源太阳能科技有限公司 | A kind of back silver paste of solar cell and preparation facilities thereof |
| CN108580805A (en) * | 2018-04-23 | 2018-09-28 | 芜湖市华邦流体科技有限公司 | A kind of vacuum casting for butterfly plate casting |
| CN112916851A (en) * | 2021-01-25 | 2021-06-08 | 江苏博迁新材料股份有限公司 | Preparation method of silver-nickel composite powder |
| CN112935244A (en) * | 2021-01-27 | 2021-06-11 | 刘勤华 | Silver-coated copper composite powder process for photovoltaic use and replacing pure silver slurry |
| CN116117136A (en) * | 2023-02-16 | 2023-05-16 | 安靖盛(江苏)电子新材料有限公司 | Silver-coated copper powder and application thereof |
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| CN1403233A (en) * | 2002-10-10 | 2003-03-19 | 武汉大学 | Silver-plated copper powder and its prepn process |
| JP2003105404A (en) * | 2001-09-28 | 2003-04-09 | Mitsui Mining & Smelting Co Ltd | Producing method for silver coated copper powder, silver coated copper powder obtained by the producing method, conductive paste using the silver coated copper powder and printed circuit board using the conductive paste |
| CN101774025A (en) * | 2010-01-19 | 2010-07-14 | 山东天诺光电材料有限公司 | Preparation method of silver-plated copper powder |
| CN102133636A (en) * | 2011-03-10 | 2011-07-27 | 昆明理工大学 | Method for preparing anti-migration flaky silver coated copper powder |
| CN102328076A (en) * | 2011-06-20 | 2012-01-25 | 宁波广博纳米新材料股份有限公司 | Preparation method of silver coated copper powder for electronic slurry |
| CN102990061A (en) * | 2012-11-07 | 2013-03-27 | 宁波广博纳米新材料股份有限公司 | Preparation method of tightly-combined silver-coated copper powder |
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Patent Citations (6)
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| JP2003105404A (en) * | 2001-09-28 | 2003-04-09 | Mitsui Mining & Smelting Co Ltd | Producing method for silver coated copper powder, silver coated copper powder obtained by the producing method, conductive paste using the silver coated copper powder and printed circuit board using the conductive paste |
| CN1403233A (en) * | 2002-10-10 | 2003-03-19 | 武汉大学 | Silver-plated copper powder and its prepn process |
| CN101774025A (en) * | 2010-01-19 | 2010-07-14 | 山东天诺光电材料有限公司 | Preparation method of silver-plated copper powder |
| CN102133636A (en) * | 2011-03-10 | 2011-07-27 | 昆明理工大学 | Method for preparing anti-migration flaky silver coated copper powder |
| CN102328076A (en) * | 2011-06-20 | 2012-01-25 | 宁波广博纳米新材料股份有限公司 | Preparation method of silver coated copper powder for electronic slurry |
| CN102990061A (en) * | 2012-11-07 | 2013-03-27 | 宁波广博纳米新材料股份有限公司 | Preparation method of tightly-combined silver-coated copper powder |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128550A (en) * | 2016-08-30 | 2016-11-16 | 乐山新天源太阳能科技有限公司 | A kind of back silver paste of solar cell and preparation facilities thereof |
| CN108580805A (en) * | 2018-04-23 | 2018-09-28 | 芜湖市华邦流体科技有限公司 | A kind of vacuum casting for butterfly plate casting |
| CN112916851A (en) * | 2021-01-25 | 2021-06-08 | 江苏博迁新材料股份有限公司 | Preparation method of silver-nickel composite powder |
| CN112916851B (en) * | 2021-01-25 | 2023-11-28 | 江苏博迁新材料股份有限公司 | Preparation method of silver-nickel composite powder |
| CN112935244A (en) * | 2021-01-27 | 2021-06-11 | 刘勤华 | Silver-coated copper composite powder process for photovoltaic use and replacing pure silver slurry |
| CN116117136A (en) * | 2023-02-16 | 2023-05-16 | 安靖盛(江苏)电子新材料有限公司 | Silver-coated copper powder and application thereof |
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Application publication date: 20151216 |