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Silver nanowire ink, process for producing same, and electroconductive film

A technology of silver nanowires and a manufacturing method, which is applied to inks, conductive coatings, conductive materials, etc., can solve problems such as increased sheet resistance of conductive films, and achieve the effects of eliminating reduced conductivity, stable line distribution, and eliminating poor appearance.

Inactive Publication Date: 2019-03-01
DOWA ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if such a surfactant-added silver nanowire ink is used, the sheet resistance of the resulting conductive film increases.

Method used

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  • Silver nanowire ink, process for producing same, and electroconductive film
  • Silver nanowire ink, process for producing same, and electroconductive film
  • Silver nanowire ink, process for producing same, and electroconductive film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] [Synthesis of silver nanowires]

[0084] Silver nanowires were obtained by the following method.

[0085] Prepare a copolymer of propylene glycol (1,2-propanediol) as a solvent, vinylpyrrolidone and diallyldimethylammoniumnitrate (99% by mass of vinylpyrrolidone, diallyl Dimethylammonium nitrate 1% by mass was used for copolymer synthesis (weight-average molecular weight: 130,000) and silver nitrate, lithium chloride, potassium bromide, lithium hydroxide, and aluminum nitrate nonahydrate.

[0086] At room temperature (23°C), 0.15 g of a propylene glycol solution containing 1 mass % of lithium chloride, 0.10 g of a propylene glycol solution containing 0.25 mass % of potassium bromide, and 1 mass % of lithium hydroxide were added to 20.0 g of propylene glycol. 0.20 g of a propylene glycol solution, 0.16 g of a propylene glycol solution containing 2% by mass of aluminum nitrate nonahydrate, and 0.26 g of a copolymer of vinylpyrrolidone and diallyldimethylammonium nitrate ...

Embodiment 2

[0106] [Synthesis of silver nanowires]

[0107] As an organic protective agent, a copolymer composition composed of a copolymer of vinylpyrrolidone and diallyldimethylammoniumnitrate was prepared. The polymerization composition of this copolymer was 99% by mass of vinylpyrrolidone and 1% by mass of diallyldimethylammonium nitrate. The weight average molecular weight Mw was 92,000.

[0108] At room temperature, 4.84 g of a propylene glycol solution containing 10% by mass of lithium chloride, 0.1037 g of potassium bromide, 0.426 g of lithium hydroxide, and 4.994 g of a propylene glycol solution containing 20% ​​by mass of aluminum nitrate nonahydrate were added to 8116.3 g of propylene glycol. . 83.875 g of a copolymer of vinylpyrrolidone and diallyldimethylammonium nitrate was dissolved to prepare a solution A. In a separate container, 67.96 g of silver nitrate was added to a mixed solution of 95.70 g of propylene glycol and 8.00 g of pure water, stirred and dissolved at 35° ...

Embodiment 3

[0123] The silver nanowire dispersion (concentrated and purified dispersion) obtained in Example 2 was used to form an ink to produce a transparent conductor.

[0124] [inking]

[0125] Silver nanowire ink was prepared in the same manner as in Example 2. Among them, in the composition of the mixture, the mass ratio of water / isopropanol is 80 / 20, the HEMC component is 0.10% by mass, and the water-soluble acrylic-urethane copolymer resin component is 0.05% with respect to the total amount of the mixture. % by mass, the mixing amount of each substance was adjusted so that the metallic silver of the silver nanowires became 0.10% by mass. The HEMC / silver mass ratio was 1.0. The obtained silver nanowire ink had a viscosity of 7.7 mPa·s and a surface tension of 32.1 mN / m at a shear rate of 600 (1 / s).

[0126] [transparent conductor]

[0127] Using the above-mentioned silver nanowire ink, a transparent dry coating film was produced in the same manner as in Example 2, and under the...

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Abstract

To provide a silver nanowire ink which is less apt to form bundle-shaped wire agglomerates even when applied with a die coater, and is capable of stably forming transparent conductors that have satisfactory electroconductivity. A silver nanowire ink which comprises silver nanowires coated with a copolymer of vinylpyrrolidone and a hydrophilic monomer and a liquid medium containing hydroxyethyl methyl cellulose (HEMC), the nanowires being dispersed in the liquid medium, wherein the content of the HEMC in the ink is 0.01-1.0 mass%.

Description

technical field [0001] The present invention relates to a silver nanowire ink useful as a material for forming a transparent conductor and a conductive film using the same. Moreover, it relates to the manufacturing method of this silver nanowire ink. Background technique [0002] In this specification, a fine metal wire having a thickness of about 200 nm or less is referred to as a "nanowire (s)". A liquid in which silver nanowires are dispersed, especially a coating liquid whose properties such as viscosity have been adjusted in consideration of coating on a substrate is called "silver nanowire ink". An ink that has a predetermined property by adding a binder component, a viscosity modifier, etc. to a liquid in which silver nanowires are dispersed is called "inking". A transparent coating film obtained by applying silver nanowire ink to a base material and drying it is called a transparent conductor. [0003] Silver nanowires are considered promising as a conductive mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/037B22F1/00B22F1/02B82Y30/00B82Y40/00C09D11/52H01B1/00H01B1/22H01B13/00B22F1/16
CPCB22F1/00B82Y30/00B82Y40/00C09D11/037C09D11/52H01B1/00H01B1/22H01B13/00C09D11/14C09D5/24C09D7/62C09D7/70C08K7/06C08K9/04C08K2003/0806B22F1/16B22F1/0547B22F2301/255
Inventor 佐藤王高斋藤宏敏
Owner DOWA ELECTRONICS MATERIALS CO LTD