Preparation method for secondarily-silver-plated highly-conductive filling material
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A high conductivity, secondary plating technology, applied in liquid chemical plating, metal material coating process, coating, etc., can solve the problems of low conductivity, low density of graphene oxide, and increased density of composite materials, etc., to achieve excellent Conductivity, easy operation, and strong bonding effect
Active Publication Date: 2019-03-05
BEIJING UNIV OF CHEM TECH
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The graphene oxide / silver composite material prepared in a small amount of reports has low conductivity, while the silver content of the graphene oxide / silver composite material with high conductivity is too high, reaching 80%, which makes the density of the composite material increase sharply and loses The advantage of low density of graphene oxide
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Embodiment 1
[0054] 1) Add 2g of graphene oxide to 100ml of deionized water, stir evenly, and then configure 3.6g / L tannic acid and 1.2g / L ferric chloride aqueous solution, tannic acid and trichloride The iron molar ratio is 3:1, respectively added to the matrix solution, and after adjusting the pH to 8.5 with Tris-HCl buffer solution, stirred at a stirring rate of 60 rpm for 1 minute, filtered, then added to 100mL deionized water, and then added 6g / L silver nitrate solution, and 25mL ethylene glycol, and then quickly add 450uL octylamine, stirring at 60 rpm; the total reaction time does not exceed 1h. Graphene oxide with silver nanoparticles deposited on the surface is obtained. After the stirring is completed, the graphene oxide deposited with silver nanoparticles is filtered out, washed with absolute ethanol at least three times, and dried;
[0055] 2) configure a silver nitrate solution with a concentration of 10g / L, titrate with ammonia water until the precipitate just disappears, an...
Embodiment 2
[0063] Process is the same as embodiment 1, changes the mol ratio of tannic acid and iron trichloride into 1:2, 1:3, 2:1 and 3:1 in step 1), can obtain the graphite oxide that surface is coated with silver layer alkene.
[0064] It has been determined that the graphene oxide / silver core-shell composite microbeads can conduct electricity, with a conductivity of 1.5—2.0×10 6 Between S / m.
Embodiment 3
[0066] The process is the same as in Example 1, and the pH of the tannic acid-ferric chloride solution in step 1) is adjusted to 7, 7.5, 8, 9, 9.5 and 10 respectively to obtain graphene oxide coated with a silver layer on the surface.
[0067] It has been determined that the graphene oxide / silver core-shell composite microbeads can conduct electricity, with a conductivity of 1.5—2.0×10 6 Between S / m.
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Abstract
The invention discloses a preparation method for a secondarily-silver-plated highly-conductive filling material. The preparation method comprises the following steps: 1) subjecting a substrate to ultrasonic dispersion in deionized water, successively adding tannic acid and a ferric trichloride solution, and carrying out uniform mixing under stirring so as to obtain a substrate surface-deposited with polytannic acid-ferric trichloride; 2) dissolving the obtained substrate in deionized water, adding a silver nitrate solution and ethylene glycol, and carrying out reducing with octylamine so as toobtain a substrate having silver nanoparticle on the surface after primary silver plating; 3) titrating a silver nitrate solution with ammonia until a precipitate just disappears so as to prepare a silver plating solution; 4) placing the substrate having the silver nanoparticle on the surface into the silver plating solution prepared in the step 3), adding a dispersant, and carrying out stirring;and 5) adding a reducing agent solution so as to obtain a substrate with silver layer covered surface. The preparation method provided by the invention is simple and convenient to operate, greatly shortens the time of modification, realizes uniform and compact silver plating, and prepares a composite material with excellent bonding stability and electrical conductivity.
Description
technical field [0001] The present invention relates to the technical field of electromagnetic shielding materials, and furthermore, relates to a method for preparing a secondary silver-plating high-conductivity filler, which is used to functionalize the surface of tannic acid-ferric chloride through the secondary silver-plating method. The modification undergoes a secondary reduction to prepare a matrix / silver composite. Background technique [0002] With the rapid development of the electrical and electronic industry, electromagnetic radiation has become an increasingly serious problem. At present, the commonly used electromagnetic radiation protection materials in China have disadvantages such as high cost, high density, poor mechanical properties, and low shielding efficiency, which cannot meet the needs of the market. Electromagnetic shielding rubber material (ESR) refers to the rubber composite material with excellent electromagnetic shielding function and excellent m...
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