A kind of method for preparing surface silver-plated composite material
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A composite material, silver-plating technology, applied in metal material coating process, liquid chemical plating, coating and other directions, can solve the problems of difficult to meet the high conductivity field, negative surface potential of aluminum powder, large specific surface area, etc. The effect of good plating effect, uniform and dense silver layer, and excellent electrical conductivity
Active Publication Date: 2020-02-18
BEIJING UNIV OF CHEM TECH
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[0005] However, since there are almost no active functional groups on the surface of graphene, the specific surface area is large, the surface energy is high, and the surface potential of aluminum powder is relatively negative. Uniform and dense silver plating
At present, most of the reports on silver-coated graphene are applications in catalysis, antibacterial, surface-enhanced Raman spectroscopy, etc. There are very few reports on the field of conductivity, and the conductivity is generally less than 10. 3 S / cm, while silver-plated aluminum powder is rarely reported, and the conductivity is less than 10 3 S / cm, difficult to meet the needs of high conductivity field
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Embodiment 1
[0056] 1) After ultrasonically cleaning 4g of aluminum powder in ethanol solution, place it in a solution of 1.1g / L catechol and 1.0g / L diethylenetriamine, adjust the pH to 9 with Tris-HCl, and stir the reaction 4h, obtain the aluminum powder that surface is deposited with poly(catechol-polyamine);
[0057] 2) Add 4g of aluminum powder with poly(catechol-polyamine) deposited on the surface into 50ml of ethylene glycol solution in which 5mg of polyvinylpyrrolidone is dissolved, add 50ml of silver nitrate aqueous solution, the concentration is 12g / L, and then add 0.78 g n-octylamine, stirred and reacted for 60min, washed 3 times with ethanol to obtain aluminum powder with silver nanoparticles deposited on the surface;
[0058] 3) prepare 50ml concentration and be the silver nitrate solution of 10g / L, when titrating with ammoniacal liquor until precipitation just disappears, obtain silver plating solution;
[0059] 4) 4g of the aluminum powder that is deposited with silver nanop...
Embodiment 2
[0065] The process is the same as in Example 1, and the concentration of catechol and diethylenetriamine in step 1) is changed to 0.5, 1.5, 2, 2.5 g / L to obtain silver-coated aluminum powder.
[0066] After measurement, the electrical conductivity of the obtained silver-plated aluminum powder is 3333, 6667, 1.0×10 4 , 1.0×10 4 S / cm.
Embodiment 3
[0068] The process is the same as in Example 1, except that the diethylenetriamine in step 1) is changed to triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexaethyleneheptamine or polyethyleneimine to obtain silver-plated aluminum powder.
[0069] After measurement, the conductivity of the obtained silver-plated aluminum powder is 5000, 1.0×10 4 , 6667, 6667, 5000S / cm.
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Abstract
The invention discloses a method for preparing a surface silvering composite material. The method for preparing the surface silvering composite material comprises the steps that (1) a matrix is placedinto a catechol and polyamine solution and mixed uniformly after cleaned in an ethanol solution with ultrasonic wave; (2) the matrix with the surface deposited with poly-(catechol-polyamine) is addedinto an ethylene glycol solution dissolved in polyvinylpyrrolidone, a silver nitrate water solution is added, and then, a reducing agent is added; (3) when the silver nitrate solution is deposited bytitrating with ammonia water and just disappears, a silvering solution is prepared; (4) the matrix deposited with silver nanoparticles is added into the silvering solution of the step (3), and the polyvinylpyrrolidone is added; and (5) a reducing agent water solution is added, mixing is carried out for 30-60 min, and the matrix with surface silvering is obtained after suction filtration. According to the method for preparing the surface silvering composite material, the operation is simple and convenient, uniform and tight silvering layers can be prepared on the surfaces of most materials with more difficult silvering, and the bonding stability and conductivity performance of the prepared composite material are good.
Description
technical field [0001] The invention relates to the technical field of conductive composite materials, and more specifically, relates to a method for preparing a silver-plated composite material on the surface. Background technique [0002] Metal powder is an important raw material for electronics industry and national defense industry. Due to the high density of metal, it is difficult to avoid the occurrence of sedimentation during storage and use of materials with metal fine powder as the main conductive medium, which will greatly affect the use of the product. Core-shell structure powder refers to a composite material with low-cost, low-density organic or inorganic powder as the core and highly conductive metal as the shell. It can reduce the The density and cost of conductive powder have a wide range of applications in industry and military. [0003] Graphene is a honeycomb planar film formed by sp2 hybridization of carbon atoms. It has good electrical and thermal cond...
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