Large-grain-size spherical silver powder and preparation method thereof

A large particle size, silver powder technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of narrow particle size dispersion range, rarely mention the preparation process of large particle size spherical silver powder, etc. High tap density and good stability

Inactive Publication Date: 2017-05-10
广东羚光新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In most of the invention patents of spherical silver powder in the past, the prepared spherical silver powder has a particle size of less than 3 μm, and the particle size dispersion range is narrow. It is mainly used in electronic paste for printing high-resolution circuits; Preparation technology of spherical silver powder with particle size

Method used

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  • Large-grain-size spherical silver powder and preparation method thereof
  • Large-grain-size spherical silver powder and preparation method thereof
  • Large-grain-size spherical silver powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The large particle size spherical silver powder of the present embodiment and preparation method thereof, the steps are as follows:

[0034] (1) Take silver nitrate solid 1kg and place it in the batching bucket, add 4L of pure water to dissolve; add pure water at last to dilute the system to 5L, and make a silver nitrate system with a silver nitrate content of about 200g / L;

[0035] (2) Weigh 0.6 kg of ascorbic acid and add 18 L of pure water to dissolve, add 5 g of pre-dissolved sodium lauryl sulfate; stir evenly and add pure water to dilute the system to 20 L, stir evenly to form a reduction system;

[0036] (3) Adjust the temperature of the silver nitrate system and the reduction system to 20° C., using the reduction system as the matrix, and at a stirring speed of 80 r / min, add the silver nitrate system to the reduction system within 1 min for reaction;

[0037] (4) After the reaction is completed and aged for 5 minutes, the silver powder is moved to a filter tank f...

Embodiment 2

[0040] The large particle size spherical silver powder of the present embodiment and preparation method thereof, the steps are as follows:

[0041] (1) Take silver nitrate solid 1kg and place it in the batching bucket, add 4L of pure water to dissolve; add pure water at last to dilute the system to 5L, and make a silver nitrate system with a silver nitrate content of about 200g / L;

[0042] (2) Weigh 0.6 kg of ascorbic acid and add 18 L of pure water to dissolve, add 5 g of pre-dissolved sodium oleate; stir evenly and add pure water to dilute the system to 20 L, stir evenly to form a reduction system;

[0043] (3) Adjust the silver nitrate system and the reduction system to 20°C, take the reduction system as the matrix, and add the silver nitrate system to the reduction system within 1 min at a stirring speed of 80r / min for reaction;

[0044] (4) After the reaction is completed and aged for 5 minutes, the silver powder is moved to the filter tank for cleaning and filtration unt...

Embodiment 3

[0047] The large particle size spherical silver powder of the present embodiment and preparation method thereof, the steps are as follows:

[0048] (1) Take silver nitrate solid 1kg and place it in the batching bucket, add 4L of pure water to dissolve; add pure water at last to dilute the system to 5L, and make a silver nitrate system with a silver nitrate content of about 200g / L;

[0049] (2) Weigh 0.6 kg of ascorbic acid and add 18 L of pure water to dissolve, add 5 g of pre-dissolved calcium lignosulfonate; stir evenly and add pure water to dilute the system to 20 L, stir evenly to form a reduction system;

[0050] (3) Adjust the silver nitrate system and the reduction system to 15°C, take the reduction system as the matrix, and add the silver nitrate system to the reduction system within 1 min at a stirring speed of 80r / min for reaction;

[0051](4) After the reaction is completed and aged for 5 minutes, the silver powder is moved to a filter tank for cleaning and filtrati...

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Abstract

The invention discloses a preparation method of large-grain-size spherical silver powder. The preparation method comprises the following steps: (1) weighing silver nitrate solid, adding water to dissolve, adding water to dilute and stirring uniformly to prepare a silver nitrate system; (2) weighing a reducing agent, adding water to dissolve, adding a dispersing agent, adding water to dilute and stirring uniformly to prepare a reduction system; (3) adjusting the temperature of the two system to be 5 to 60 DEG C, taking the reduction system as a parent body, and adding the silver nitrate system into the reduction system at a set stirring speed to react; and (4) after reaction is finished, cleaning silver powder until the electrical conductivity is less than or equal to 20 microseconds/centimeter, filtering and drying the silver powder. The silver powder prepared by the method has high tap density and small specific surface area; the granules of the silver powder have the characteristics of large grain size, narrow distribution range, high sphericity degree, smooth surface and the like; and the silver powder is mainly applied to pore filling of an electronic circuit and can be applied to electronic device end and thick film integrated circuit slurry.

Description

technical field [0001] The invention relates to the technical field of metal powder materials, in particular to a large-diameter spherical silver powder and a preparation method thereof. Background technique [0002] Among all metals, silver has good conductivity and is often used in circuits that require high conductivity; at the same time, silver is relatively cheap among noble metals. Due to its excellent physical and chemical properties, it is widely used in the field of application. widely. Silver powder prepared from silver is a functional raw material widely used in the electronics industry, such as used to make electronic pastes, wire coatings, electromagnetic shielding coatings, conductive inks, conductive plastics, conductive ceramics, etc. The added value of its products very high. [0003] At present, the synthesis methods of nano-silver powder include electrolysis, solvothermal method, microwave method, soft template method, optical reduction method, and chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00
CPCB22F9/24B22F1/065
Inventor 梁炳联宋先刚谭汝泉娄红涛邱衍嵩罗泽平
Owner 广东羚光新材料股份有限公司
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