Silver fine particles, production process therefor, conductive paste, conductive membrane and electronic device, containing said silver fine particles

A manufacturing method and technology of silver particles, applied in the field of conductive paste, can solve problems such as being difficult to oxidize, and achieve the effects of reducing carbon content, excellent low-temperature sinterability, and high yield

Inactive Publication Date: 2014-08-27
TODA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, compared with other conductive particles such as copper, although silver particles are expensive and easily cause migration in metal particles, they are not easily oxidized compared with copper with the same electrical resistivity, so they are easy to handle.

Method used

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  • Silver fine particles, production process therefor, conductive paste, conductive membrane and electronic device, containing said silver fine particles
  • Silver fine particles, production process therefor, conductive paste, conductive membrane and electronic device, containing said silver fine particles
  • Silver fine particles, production process therefor, conductive paste, conductive membrane and electronic device, containing said silver fine particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1－1

[0084]

[0085] After adding 5.16 kg of silver nitrate, 25.8 L of methanol, and 4.89 kg of n-butylamine into a 50 L container, they were mixed and stirred while cooling to below 15° C. to prepare liquid A. Separately, 27.8 L of water and 8.03 kg of erythorbic acid were weighed in a 50 L container, stirred and dissolved, then 3.78 g of sodium chloride was added, and mixed and stirred while cooling to below 15° C., to prepare B liquid.

[0086] Next, while mixing liquid A and liquid B using a static mixer, add them to a 7 L container containing water, cool the reaction system to below 25°C, and stir for 5 hours, then let stand for 30 minutes to make the solid content settlement. After removing the supernatant by decantation, suction filtration was performed using filter paper, followed by washing and filtration with methanol and pure water.

[0087] A part of the solid content of the obtained silver fine particles was dried in a drier at 40° C. for 6 hours, and then pulverize...

Embodiment 2－1

[0089]

[0090] With respect to 100 parts by weight of silver particles in Example 1-1, 11.0 parts by weight of polyester resin and 1.4 parts by weight of curing agent were added, and diethylene glycol monoethyl ether was added so that the content of silver particles in the conductive paste was 70 wt%. After pre-mixing by a rotary mixer "Awatori Rentaro ARE-310" (manufactured by THINKY Co., Ltd., registered trademark), uniform kneading and dispersion were performed using a three-roll mill to obtain a conductive paste.

[0091] The conductive paste obtained above was coated on a polyimide film having a film thickness of 50 μm, and heated at 120° C., 210° C., and 300° C. for 30 minutes, respectively, to obtain conductive coating films.

[0092] The resistivity when the obtained conductive coating film was heat-treated at 120° C. for 30 minutes was 9.5×10 －6 Ω·cm, the resistivity when heat-treated at 210°C for 30 minutes is 4.1×10 －6 Ω·cm, the resistivity is 2.6×10 when heat t...

Embodiment 1－2～1－3

[0094] Examples 1-2 to 1-3 and Comparative Examples 1-1 to 1-2:

[0095] Silver fine particles were obtained by variously changing the production conditions of silver fine particles.

[0096] Table 1 shows the production conditions at this time, and Table 3 shows various characteristics of the obtained silver fine particles.

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Abstract

The present invention pertains to: silver fine particles with excellent low-temperature sinterability; a production process therefor; and a conductive paste, a conductive membrane and an electronic device, containing the silver fine particles. In a process for producing silver fine particles which comprises preparing an alcoholic solution (A) of a silver nitrate-amine complex prepared using silver nitrate and at least one water-soluble C2-4 aliphatic amine, preparing, separately from the solution (A), an aqueous solution (B) in which either ascorbic acid or erythorbic acid and a halide are dissolved, adding a mixture of the solution (A) with the solution (B) into a vessel in which water has been put, stirring the resulting mixture, and then subjecting the thus obtained silver fine particles to washing and drying, at least 1.6*10<-3> mol of a halide per mol of silver nitrate is added to the solution (B), whereby an aggregate silver fine particle slurry can be obtained to facilitate the subsequent washing. Thus, silver fine particles which have a carbon content of 0.25wt% or less and thus exhibit excellent low-temperature sinterability can be obtained.

Description

technical field [0001] The present invention relates to silver microparticles having an average particle diameter of 30 to 120 nm excellent in low-temperature sinterability, a method for producing the same, and a conductive paste, a conductive film, and an electronic device containing the silver microparticles. Background technique [0002] Electrodes or circuit patterns of electronic devices are formed by printing electrodes or circuit patterns on a substrate using a conductive paste containing metal particles, followed by heating and firing to sinter the metal particles contained in the conductive paste. In recent years, the heating and firing temperature tends to be lowered. [0003] For example, as a mounting substrate of an electronic device, in general, a flexible substrate made of polyimide is used because it can be heated to about 300°C and has excellent heat resistance. PET (polyethylene terephthalate) substrate and PEN (polyethylene naphthalate) substrate. Howeve...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B22F1/02B22F9/00B82Y30/00B82Y40/00H01B1/00H01B1/22H01B5/14B22F1/054B22F1/102
CPCB82Y30/00B82Y40/00B22F1/0062B22F9/24B22F2301/255H01B1/22B22F2304/054B22F1/0018B22F1/054B22F1/102B22F1/056
Inventor 岩崎敬介柿原康男饭田哲二大杉峰子山本洋介石谷诚治森井弘子林一之
Owner TODA IND
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