Preparation method of functional silver powder for electronic paste
A kind of electronic paste, functional technology, applied in the direction of metal processing equipment, transportation and packaging, etc., to achieve the effect of good conductivity, uniform size and less variety
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Embodiment 1
[0046] This example provides the preparation method of functional silver powder for electronic paste, the steps include:
[0047] S1: Add the solvent to the silver powder raw material, mix well and then add the coating agent;
[0048] S2: injecting carbon dioxide into the product of step S1 for coating treatment;
[0049] S3: the product obtained in the solid-liquid separation step S2, the solid product is sintered and then washed;
[0050] S4: Add a dispersant to the product obtained in step S3, stir evenly, and obtain the functional silver powder for electronic paste after drying;
[0051] The solvent is alcohol or ether solution of halogen bismuth compound.
[0052] In step S1, the mass ratio of the solvent to the silver powder raw material is (50-150):1. After the solvent is added to the silver powder raw material, it is stirred at a speed of 100-17000 rpm at room temperature. The coating agent includes at least one of sodium hydroxide or potassium hydroxide. The mass...
Embodiment 2
[0062] In this example, a functional silver powder for electronic paste is prepared, and the preparation steps include:
[0063] S1: Add the solvent to the silver powder raw material, mix well and then add the coating agent;
[0064] S2: injecting carbon dioxide into the product of step S1 for coating treatment;
[0065] S3: the product obtained in the solid-liquid separation step S2, the solid product is sintered and then washed;
[0066] S4: Add a dispersant to the product obtained in step S3, stir evenly, and obtain the functional silver powder for electronic paste after drying;
[0067] The solvent is ethanol solution of bismuth chloride, wherein the concentration of bismuth chloride is 50ppm.
[0068] The microscopic morphology of the silver powder raw materials used is as follows: figure 1 As shown, the shape is irregular and the surface is rough. The tap density is 4.2g / cm 3 .
[0069] In step S1, the mass ratio of the solvent to the silver powder raw material is ...
Embodiment 3
[0075] In this example, a functional silver powder for electronic paste is prepared, and the preparation steps include:
[0076] S1: Add the solvent to the silver powder raw material, mix well and then add the coating agent;
[0077] S2: injecting carbon dioxide into the product of step S1 for coating treatment;
[0078] S3: the product obtained in the solid-liquid separation step S2, the solid product is sintered and then washed;
[0079] S4: Add a dispersant to the product obtained in step S3, stir evenly, and obtain the functional silver powder for electronic paste after drying;
[0080] The solvent is bismuth bromide in dipropylene glycol propyl ether solution, wherein the concentration of bismuth bromide is 50ppm.
[0081] The microscopic morphology of the silver powder raw materials used is as follows: figure 1 As shown, the shape is irregular and the surface is rough. The tap density is 4.2g / cm 3 .
[0082] In step S1, the mass ratio of the solvent to the silver p...
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