Method for producing silver nanoparticles, silver nanoparticles, and silver coating composition

Patent metadata

Field	Value
Publication number	US-2018168037-A1
Application number	US-201715821540-A
Country	US
Kind code	A1
Filing date	Nov 22, 2017
Priority date	Jan 11, 2012
Publication date	Jun 14, 2018
Grant date	—

Abstract

The present invention provides silver nano-particles that are excellent in stability and develop excellent conductivity by low-temperature calcining, a producing method for same, and a silver coating composition comprising the silver nano-particles. A method for producing silver nano-particles comprising: preparing an amine mixture liquid comprising: an aliphatic hydrocarbon monoamine (A) comprising an aliphatic hydrocarbon group and one amino group, said aliphatic hydrocarbon group having 6 or more carbon atoms in total; an aliphatic hydrocarbon monoamine (B) comprising an aliphatic hydrocarbon group and one amino group, said aliphatic hydrocarbon group having 5 or less carbon atoms in total; and an aliphatic hydrocarbon diamine (C) comprising an aliphatic hydrocarbon group and two amino groups, said aliphatic hydrocarbon group having 8 or less carbon atoms in total; mixing a silver compound and the amine mixture liquid to forma complex compound comprising the silver compound and the amines; and thermally decomposing the complex compound by heating to form silver nano-particles.

First claim

1 . A method for producing silver nano-particles comprising:
preparing an amine mixture liquid comprising: an aliphatic hydrocarbon monoamine (A) comprising an aliphatic hydrocarbon group and one amino group, said aliphatic hydrocarbon group having 6 or more carbon atoms in total; an aliphatic hydrocarbon monoamine (B) comprising an aliphatic hydrocarbon group and one amino group, said aliphatic hydrocarbon group having 5 or less carbon atoms in total; and an aliphatic hydrocarbon diamine (C) comprising an aliphatic hydrocarbon group and two amino groups, said aliphatic hydrocarbon group having 8 or less carbon atoms in total; mixing a silver compound and the amine mixture liquid to form a complex compound comprising the silver compound and the amines; and thermally decomposing the complex compound by heating to form silver nano-particles.

2 . The method for producing silver nano-particles according to claim 1 , wherein the aliphatic hydrocarbon monoamine (A) is an alkylmonoamine having 6 or more and 12 or less carbon atoms.

3 . The method for producing silver nano-particles according to claim 1 or 2 , wherein the aliphatic hydrocarbon monoamine (B) is an alkylmonoamine having 2 or more and 5 or less carbon atoms.

4 . The method for producing silver nano-particles according to any one of claims 1 to 3 , wherein the aliphatic hydrocarbon monoamine (B) is a butylamine.

5 . The method for producing silver nano-particles according to any one of claims 1 to 4 , wherein the silver compound is silver oxalate.

6 . The method for producing silver nano-particles according to any one of claims 1 to 5 , wherein the aliphatic hydrocarbon monoamine (A) is contained in the amine mixture liquid in an amount of 10 mol % to 65 mol % of a total of the monoamine (A), the monoamine (B), and the diamine (C).

7 . The method for producing silver nano-particles according to any one of claims 1 to 6 , wherein the aliphatic hydrocarbon monoamine (B) is contained in the amine mixture liquid in an amount of 5 mol % to 50 mol % of a total of the monoamine (A), the monoamine (B), and the diamine (C).

8 . The method for producing silver nano-particles according to any one of claims 1 to 7 , wherein the aliphatic hydrocarbon diamine (C) is contained in the amine mixture liquid in an amount of 15 mol % to 50 mol % of a total of the monoamine (A), the monoamine (B), and the diamine (C).

9 . The method for producing silver nano-particles according to any one of claims 1 to 8 , wherein the monoamine (A), the monoamine (B), and the diamine (C) are used in a total amount of 1 to 20 moles per mole of silver atoms in the silver compound.

10 . The method for producing silver nano-particles according to any one of claims 1 to 9 , wherein the amine mixture liquid further contains an aliphatic carboxylic acid (D).

11 . Silver nano-particles produced by the method according to any one of claims 1 to 10 .

12 . A silver coating composition comprising silver nano-particles produced by the method according to any one of claims 1 to 10 , and an organic solvent.

13 . A silver conductive material comprising:
a substrate, and a silver conductive layer obtained by applying, onto the substrate, a silver coating composition comprising silver nano-particles produced by the method according to any one of claims 1 to 10 and an organic solvent, and calcining the silver coating composition.

Assignees

• Univ Yamagata Nat Univ Corp
• Daicel Corp

Inventors

• Kurihara Masato
• Okamoto Kazuki
• Iguchi Yuki

Classifications

• B22F1/142

  Thermal or thermo-mechanical treatment · CPC title

• B22F1/054

  Nanosized particles · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B22F1/107

  containing organic material comprising solvents, e.g. for slip casting · CPC title

• B22F1/0545

  Dispersions or suspensions of nanosized particles · CPC title