Silver-coated copper powder and conductive paste, conductive material, and conductive sheet using same
A silver-copper, coating technology, applied in conductive coatings, conductive materials, conductive materials, etc., to achieve the effect of preventing agglomeration and excellent conductivity
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Embodiment 1
[0144]
[0145] In an electrolytic cell with a capacity of 100L, a titanium electrode plate with an electrode area of 200mm×200mm is used as the cathode, and a copper electrode plate with an electrode area of 200mm×200mm is used as the anode, and the electrolyte is filled into the electrolytic cell. In the tank, a direct current is passed through it to precipitate copper powder (dendritic copper powder) onto the cathode plate.
[0146] At this time, as the electrolytic solution, an electrolytic solution having a composition having a copper ion concentration of 5 g / L and a sulfuric acid concentration of 150 g / L was used. In addition, Safranin O (manufactured by Kanto Chemical Co., Ltd.) was added as an additive so that the concentration in the electrolyte was 100 mg / L, and the concentration of chloride ions (chloride ions) in the electrolyte was A hydrochloric acid solution (manufactured by Wako Pure Chemical Industries, Ltd.) was added so as to be 10 mg / L. Next, under t...
Embodiment 2
[0158]
[0159] As the electrolytic solution, an electrolytic solution having a copper ion concentration of 7 g / L and a sulfuric acid concentration of 150 g / L was used, and safranin O was added as an additive so that the concentration in the electrolytic solution became 150 mg / L. , and furthermore, a hydrochloric acid solution was added so that the concentration of chloride ions in the electrolytic solution became 25 mg / L. Next, under the following conditions, the current density of the cathode is 20A / dm 2 The copper powder was deposited on the cathode plate by energizing in such a way that the electrolytic solution whose concentration was adjusted as described above was circulated at a flow rate of 15 L / min using a pump, and the temperature was maintained at 25°C. Use a scraper to mechanically scrape the electrolytic copper powder deposited on the cathode plate to the bottom of the electrolytic tank and recover it. After washing the recovered copper powder with pure water, ...
Embodiment 3
[0170] The dendritic silver-coated copper powder produced in Example 1 was dispersed in a resin to prepare an electromagnetic wave shielding material. In addition, the preparation of the dendritic copper powder used to produce the dendritic silver-coated copper powder, and the conditions until the dendritic copper powder was coated with silver to produce the dendritic silver-coated copper powder were set to be the same as in Example 1, using silver Dendritic silver-coated copper powder whose coating amount is 26.2 mass % with respect to mass 100% of the whole silver-coated copper powder coated with silver.
[0171] 100 g of vinyl chloride resin and 200 g of methyl ethyl ketone were mixed with 40 g of the dendritic silver-coated copper powder, and kneading at 1500 rpm for 3 minutes was repeated four times using a small kneader to perform creaming. When pasting, the copper powder is uniformly dispersed in the resin without agglomeration. This was applied onto a substrate made o...
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Abstract
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