Method for preparing granularity-controllable narrow-distribution spherical easily-dispersible silver powder through radiation reduction
A narrow-distribution, easy-to-disperse technology, applied in the field of preparing spherical easily dispersible silver powder with controllable particle size narrow distribution, can solve the problems of small particle size, unsuitable for application, uneven surface, etc.
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Embodiment 1
[0020] Example 1 Preparation of 1.0 μm Monodisperse Spherical Silver Powder by Radiation Reduction
[0021] (1) Preparation of 200nm seed silver powder: First, add dispersant PVP (0.1% by weight) and ammonia water to 50L of silver nitrate aqueous solution (5% by weight), and the amount of ammonia water should just dissolve the system; then hydrate 50L Hydrazine aqueous solution (0.1% by weight) was added dropwise to the silver ammonia solution, and reacted at 35°C for 1 hour; the resulting silver powder was washed with deionized water several times until the aqueous solution contained no organic impurities, and a clean monodisperse Spherical seed silver powder with a particle size of 200nm;
[0022] (2) Take 1Kg of 200nm seed silver powder obtained in step (1) and add it to 10L deionized water containing dispersant PVP (0.5% by weight) and active particle capture agent (0.5% by weight), stir and disperse; then add nitric acid Silver solution (5% by weight) 10L, feed nitrog...
Embodiment 2
[0024] Example 2 Preparation of 2.0 μm Monodisperse Spherical Silver Powder by Radiation Reduction
[0025] (1) (same as embodiment 1);
[0026] (2) Take 1Kg of seed silver powder obtained in step (1) and add it to 10L deionized water containing gelatin (1% by weight) and active particle capture agent (0.5% by weight), stir and disperse; then add silver nitrate solution (weight fraction Fraction 10%) 10L, blow nitrogen and exhaust oxygen for 5 minutes;
[0027] (3) Put in the radiation source cobalt-60, and carry out the radiation reduction reaction under stirring conditions. The radiation dose rate is 0.5 kGy / h, and the absorbed dose is 5 kGy; the silver powder after the radiation reduction reaction is washed with deionized water several times , until no organic impurities are contained in the aqueous solution, a monodisperse spherical silver powder of 2.0 μm is obtained.
Embodiment 3
[0028] Example 3 Preparation of 5.0 μm Monodisperse Spherical Silver Powder by Radiation Reduction
[0029] (1) Preparation of 400nm seed silver powder: First, add dispersant PVP (0.5% by weight) and ammonia water to 10L of silver nitrate (10% by weight) aqueous solution. The amount of ammonia water should just dissolve the system; then add 5L Hydrazine hydrate aqueous solution (1% by weight) was added dropwise to the silver ammonia solution, and reacted at 35°C for 1 hour; the obtained silver powder was washed with deionized water several times until the aqueous solution contained no organic impurities, and a clean single Dispersed spherical seed silver powder with a particle size of 400nm;
[0030] (2) Take 0.5Kg of 400nm seed silver powder obtained in step (1) and add it to 20L deionized aqueous solution containing dispersant polyethylene glycol (2% by weight) and active particle capture agent (0.5% by weight), and stir to disperse , then add 20L of silver nitrate solut...
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