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A kind of preparation method of low temperature sintering high crystallinity silver powder

A high-crystallinity, low-temperature sintering technology, applied in the chemical field, can solve the problems of high sintering temperature and low crystallinity of silver powder, and achieve the effects of low production cost, good stability and simple reaction mode

Active Publication Date: 2021-11-02
广东广业华晶科技有限责任公司
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of low temperature sintering high crystallinity silver powder, the preparation method of described this low temperature sintering high crystallinity silver powder will solve the technical problem of high sintering temperature and low crystallinity of silver powder in the prior art

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  • A kind of preparation method of low temperature sintering high crystallinity silver powder
  • A kind of preparation method of low temperature sintering high crystallinity silver powder
  • A kind of preparation method of low temperature sintering high crystallinity silver powder

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Embodiment 1

[0020] Such as figure 1 Shown, the present invention provides a kind of preparation method of low-temperature sintering high crystallinity silver powder, comprises a process that utilizes chemical reduction method to obtain metallic silver particles from silver ammonia solution in reactor 8, utilizes chemical reduction method in described In the process of obtaining metal silver particles from the silver ammonia solution, the silver ammonia solution is used as an oxidizing agent, the silver ammonia solution is added in the reactor 8, and the hydroxylamine sulfate is used as a reducing agent, and the hydroxylamine sulfate is added in the reactor 8 in a jet mode, so that Hydroxylamine sulfate and silver ammonia solution are fully mixed in reactor 8, utilize the N produced in the reaction process 2 Gas, micro-nano bubbles are formed in the solution environment, and silver is deposited on the micro-nano bubbles to form nano-silver seeds with a hollow structure; then use one or mor...

Embodiment 2

[0027] Such as figure 2 As shown, the invention provides a kind of preparation method of low temperature sintering high crystallinity silver powder, comprises the steps:

[0028] 1) Weigh 5Kg of silver nitrate solid and place it in the reactor 8, add 95L of deionized water through the deionized water feed port 6, and then turn on the stirring motor 5 to drive the stirring paddle 1 to stir for dissolution, and the stirring speed is 60 rpm. After the dissolution is completed, add ammonia water with a mass percentage concentration of 25% through the ammonia water feed port 3 to adjust until the silver nitrate precipitates and then dissolves completely. At this time, the pH of the system is 9-10. Finally, weigh 650 g of solid dispersant PVP (polyvinylpyrrolidone) and place it in reactor 8, stir and dissolve to form silver ammonia solution oxidation solution, and heat and keep it at 37°C;

[0029] 2) inject 137 milliliters of the hydroxylamine sulfate aqueous solution that contai...

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Abstract

The invention provides a method for preparing low-temperature sintered high-crystallinity silver powder, which includes a process of obtaining metallic silver particles from silver-ammonia solution by chemical reduction in a reactor, using silver-ammonia solution as an oxidant, and using hydroxylamine sulfate as a reducing agent. agent, add hydroxylamine sulfate into the reactor in a jet flow mode and mix well, and use the N generated during the reaction 2 Air, micro-nano bubbles are formed in the solution environment, and silver is deposited on the micro-nano bubbles to form nano-silver seeds with a hollow structure; then one or more weak reducing agents are mixed and injected into the reactor, and an ultrasonic generator is used at the same time. The reaction solution in the reactor is dispersed by ultrasonic waves, so that the silver seeds grow independently to form silver powder, and finally centrifuged, washed and dried to obtain low-temperature sintered high-crystallinity silver powder. The production process of the invention is simple and stable, the production cost is low, the large-scale continuous industrialization is realized, and the production process can be widely used in the production of various high-end conductive silver pastes.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to the production technology of silver powder, in particular to the silver paste used for the front electrode of solar cells, and in particular to a preparation method of low-temperature sintering high-crystallinity silver powder. Background technique [0002] As the most important conductive material in silver conductive paste, silver powder is the basic component of the front electrode of solar cells. With the huge demand for high-efficiency solar cells, solar cells are developing from polycrystalline cells to monocrystalline high-efficiency cells, especially the development of PERC high-efficiency monocrystalline cells, making the conversion efficiency of solar cells greater than 25%. dominate the market. With the development of single crystal high-efficiency solar cells, higher requirements are put forward for the properties of silver powder, such as dispersibility, sinterability, crys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F2009/245B22F1/05
Inventor 龚辉姜辛
Owner 广东广业华晶科技有限责任公司
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