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Silvered aluminum powder as well as preparation method and application thereof

A technology of silver-plated aluminum and aluminum powder, which is applied in the treatment of dyed low-molecular organic compounds, fibrous fillers, etc., can solve the problems of high surface activity of aluminum powder, unstable plating solution, and difficult plating, and achieve good anti-electromagnetic Effects of interference, low cost and easy operation

Active Publication Date: 2012-07-04
TIANNUO PHOTOELECTRIC MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional electroless plating process of adding inert powder, the difficulty of aluminum powder electroless plating is that the surface activity of aluminum powder is very high and the potential is very negative.
Moreover, aluminum is an amphoteric metal, which is unstable under both acidic and alkaline conditions. Therefore, aluminum powder has a great tendency to dissolve rapidly in the plating solution, and it is easy to cause the plating solution to be unstable. Compared with other powder materials, its plating more difficult

Method used

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  • Silvered aluminum powder as well as preparation method and application thereof

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Effect test

Embodiment 1

[0035] a. first according to the copper sulfate solution whose concentration is 5g / L: the monosodium ethylenediaminetetraacetic acid solution=5:30 parts by weight of 80g / L is mixed with the concentration, stirred for 20 minutes to make it fully complexed, and then Use ammonia water to adjust the pH to 10, then put aluminum powder of 200 mesh spherical aluminum particles into it, continue to stir, wait until the plating solution is clarified, wash it with water until neutral, and obtain copper-plated aluminum powder;

[0036] b. According to the proportioning of aluminum powder: silver nitrate=100:45 parts by weight, get silver nitrate and add 10 times of water to get silver nitrate aqueous solution;

[0037] c. Put the copper-coated aluminum powder in step a in the 0.005g / L ethylenediaminetetraacetic acid monosodium salt solution, stir for 5 minutes at 80°C, and then control it within 60 minutes under stirring Slowly add the silver nitrate aqueous solution of step b, and then ...

Embodiment 2

[0040] a. first according to concentration is the copper sulfate solution of 50g / L:concentration is the ethylenediaminetetraacetic acid monosodium salt solution=20:10 weight ratio of 10g / L mixes, stirs 40 minutes, makes it fully complexed, then Use ammonia water to adjust the pH to 7.5, then put the aluminum powder of 1500 mesh spherical aluminum particles into it, continue to stir, wait until the plating solution is clarified, wash it with water until it is neutral, and obtain copper-plated aluminum powder;

[0041] b. according to the proportioning of aluminum powder: silver nitrate=100:5 parts by weight, get silver nitrate and add 25 times the amount of water to get silver nitrate aqueous solution;

[0042]c. Put the copper-coated aluminum powder in step a in 0.1g / L ethylenediaminetetraacetic acid monosodium salt aqueous solution, stir at 20°C for 20 minutes, and then control it within 20 minutes under stirring Slowly add the silver nitrate aqueous solution of step b, and t...

Embodiment 3

[0045] a. first according to the copper sulfate solution whose concentration is 25g / L: concentration is 50g / L the monosodium ethylenediamine tetraacetic acid salt solution=12: 20 parts by weight proportioning mixes, stirs 30 minutes, makes it fully complexed, then Use ammonia water to adjust the pH to 9.0, then put the aluminum powder of 800 mesh spherical aluminum particles into it, continue to stir, wait until the plating solution is clarified, wash it with water until it is neutral, and obtain copper-plated aluminum powder;

[0046] b. According to the proportioning of aluminum powder: silver nitrate=100:25 parts by weight, get silver nitrate and add 20 times of water to get silver nitrate aqueous solution;

[0047] c. Put the copper-coated aluminum powder in step a in an aqueous solution of 0.05 g / L ethylenediaminetetraacetic acid monosodium salt, stir at 50°C for 12 minutes, and then control it within 40 minutes under stirring Slowly add the silver nitrate aqueous solutio...

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Abstract

The invention provides silvered aluminum powder as well as a preparation method and application thereof. The method comprises the following steps of: (a) firstly, evenly mixing a copper sulfate solution and an EDTA (Ethylene Diamine Tetraacetic Acid) solution and then adding ammonia to adjust a pH value to 7.5-10; (b) putting aluminum powder in the mixed solution of the step (a), stirring, settling the plating bath and washing to be neutral and obtaining coppered aluminum powder; (c) adding water to silver nitrate to prepare an aqueous silver nitrate solution; (d) arranging the coppered aluminum powder of the step (b) in the aqueous EDTA solution, evenly stirring at 20-80 DEG C, then slowly adding the aqueous silver nitrate solution of the step (c), stirring for 20-150 min, adding a reducing agent to react, cleaning, centrifugating and filtering to obtain silvered aluminum powder; and (e) adding a mixed solution of organic acid esters to the silvered aluminum powder of the step (d), soaking for 0.5-2 h, filtering and drying to obtain a product.

Description

Technical field: [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of silver-coated aluminum powder; in addition, it also relates to the application of the silver-coated aluminum powder. Background technique: [0002] Traditional powder silver plating requires complex pre-treatments, such as degreasing, roughening, sensitization, activation, etc., which not only increases the complexity of the process, but also easily causes instability in the performance of the composite powder. In the silver plating process, the principle of silver mirror reaction is generally adopted, with silver nitrate as the main salt, ammonia water as the complexing agent, and formaldehyde, glucose, potassium sodium tartrate, etc. as the reducing agent. By adjusting the process, these methods can obtain better coatings, but there are problems such as high cost and difficult wastewater treatment, which bring great difficulties to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F9/24C09C1/64C09C3/08
Inventor 余凤斌朱焰焰郭涵曹建国
Owner TIANNUO PHOTOELECTRIC MATERIAL
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