Aqueous dispersion and method for producing the same

Abstract

To provide an aqueous dispersion liquid with excellent dispersibility and low tendency to agglomerate even after long-term storage, and a manufacturing method thereof.SOLUTION: The present invention relates to an aqueous dispersion liquid containing an aqueous medium, at least one kind of metal particles, and silver particles, where a ratio of the metal particles to the aqueous medium ranges from 0.1 to 10,000 mass ppm and a ratio of the silver particles to the aqueous medium is less than 30 mass ppm, and a D value represented by formula (1): D=[(D6W-D0)] / D0...(1) (where D6W is a DLS measured value (nm) of the aqueous dispersion liquid obtained under the following storage condition A and D0 is a DLS measured value (nm) of the aqueous dispersion liquid immediately before storage under the following storage condition A) is 3.0 or less. <Storage condition A> 100 mL of the aqueous dispersion solution is sealed in a 110 mL container under an air atmosphere, and the container is calmly placed in a thermostatic chamber maintained at a constant temperature of 40°C and is stored for 6 weeks.SELECTED DRAWING: None

Claims

1. An aqueous dispersion comprising an aqueous medium, at least one type of metal particle, and silver particle, The content ratio of the metal particles in the aqueous medium is 5 to 500 ppm by mass, and the content ratio of the silver particles in the aqueous medium is 1 to 25 ppm by mass. The following formula (1) D=│(D ６Ｗ ―D ０ )│ / D ０ (1) (Here, in equation (1), D ６Ｗ The DLS measurement values ​​(nm) of the aqueous dispersion obtained under the following storage conditions A, D ０ (The value shown is the DLS measurement (nm) of the aqueous dispersion immediately before storage under storage condition A below.) An aqueous dispersion in which the value of D, represented by [formula], is 2.60 or less. <Storage Condition A> 100 mL of aqueous dispersion is sealed in an air-filled container with a capacity of 110 mL, and the container is left standing in a constant temperature bath maintained at 40°C for 6 weeks.

2. The aqueous dispersion according to claim 1, wherein the at least one metal particle is a platinum particle.

3. The aqueous dispersion according to claim 1, wherein the average primary particle diameter of the metal particles is 0.1 to 1000 nm, and the average primary particle diameter of the silver particles is 0.1 to 1000 nm.

4. The aqueous dispersion according to any one of claims 1 to 3, wherein the silver particles are contained in an amount of 0.1 parts by mass or more and 50 parts by mass or less per 100 parts by mass of the metal particles.

5. A method for producing an aqueous dispersion, The aqueous dispersion comprises an aqueous medium, at least one type of metal particle, and silver particle, wherein the content ratio of the metal particle to the aqueous medium is 5 to 500 ppm by mass. Step 1 below Step 1: A step of adjusting the content ratio of the silver particles in the aqueous medium to less than 1 to 25 ppm by mass. A method for producing an aqueous dispersion, comprising the following:

Images