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Simple preparation method and application of gold powder

A gold powder, a simple technology, applied in the field of simple preparation of gold powder, can solve the problems of the influence of gold powder conductivity, high organic content of gold powder, complicated preparation process, etc., and achieve the effect of good conductivity, low organic content and excellent work performance

Pending Publication Date: 2022-03-29
成都市天甫金属粉体有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing gold powder prepared, such as the spherical gold powder for electronic paste prepared by Chinese patent CN201710679194.6, has a relatively smooth surface, and it is difficult to effectively combine with the paste, which will lead to the subsequent sintering process. Electrode local resistance is too high
In addition, the preparation process disclosed in patent CN201710679194.6 is complicated, the production cost is high, the organic content of the prepared gold powder is high, and the conductivity of the gold powder is easily affected

Method used

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  • Simple preparation method and application of gold powder
  • Simple preparation method and application of gold powder
  • Simple preparation method and application of gold powder

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Effect test

Embodiment 1

[0033] The method for preparing gold powder preparation of the present embodiment, concrete implementation steps are as follows:

[0034] (1) Prepare reducing agent solution A: first add 2L of deionized water into the reactor, add 30g of sodium sulfite, stir and dissolve completely, and obtain reducing agent solution A;

[0035] (2) Preparation of gold-containing solution B: dilute the chloroauric acid solution with deionized water, and configure it into a chloroauric acid solution with a pH value of 0.6-1 and a concentration of 100 g / L to obtain gold-containing solution B;

[0036] (3) Take 0.5L gold-containing solution B and add it to the prepared reducing agent solution A at 25mL / s. During the reaction, the temperature is kept between 60-100°C. After the reaction is completed, wash it with deionized water and alcohol successively Precipitate (gold powder), and dry at 60 ° C, that is.

[0037] The obtained gold powder particles are as figure 1 As shown, the physical proper...

Embodiment 2

[0042] In this embodiment, the gold powder prepared in Example 1 is tested for organic matter content by the thermogravimetric method, and the specific testing process is as follows:

[0043] After the gold powder is placed in a high temperature environment of 400°C for 1 hour, the difference in weight before and after weighing is the organic content.

[0044] As a result of testing, the organic content in the prepared gold powder was 0.12%. It can be seen that the organic content in the prepared gold powder is extremely low and has better electrical conductivity.

Embodiment 3

[0046] In order to verify the influence of adding a dispersant to the reducing agent in the present embodiment on the preparation of gold powder, no dispersant is added to the reducing agent solution B during the preparation of the gold powder. The dispersant is specifically hydroxymethyl cellulose, gelatin, A kind of in gum arabic, other preparation process and composition consumption are the same as embodiment 1, and the gold powder particle that obtains is as follows figure 2 , image 3 , Figure 4 As shown, the physical properties of the gold powder are as follows:

[0047] Table 2 Physical properties of gold powder prepared without adding dispersant

[0048]

[0049] Depend on Figure 2~4 It can be seen from the data in Table 2 that if carboxymethyl cellulose is used as a dispersant, the particle size of the prepared gold powder is too small and the span is too large. During the sintering process, it may cause partial burning and partial non-burning, and the resist...

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Abstract

The invention discloses a simple preparation method of gold powder, which comprises the following steps: 1) preparing a reducing agent solution A by using sodium sulfite as a solute and deionized water as a solvent; 2) diluting the chloroauric acid solution with deionized water to obtain a gold-containing solution B; and 3) adding the gold-containing solution B into the reducing agent solution A for reaction, and after the reaction is completed, cleaning and drying the reaction precipitate to obtain the gold-containing composite material. According to the method, sodium sulfite is adopted as a reducing agent, the crystallization mode of the gold powder is adjusted, small flaky gold powder is aggregated into sphere-like gold powder, the sphere-like gold powder can be better fused with the slurry, the preparation reaction is rapid and efficient, the time cost is saved, a dispersing agent does not need to be added, the production cost can be reduced, and the production efficiency is improved. And the phenomenon that extra organic matter is brought into the gold powder due to the dispersing agent can be avoided, and the obtained gold powder is low in organic content, more excellent and stable in conductivity, capable of being widely applied to high-precision advanced equipment and suitable for being widely popularized and applied to industrial production.

Description

technical field [0001] The invention relates to the technical field of chemical material manufacturing, in particular to a simple preparation method of gold powder and its application. Background technique [0002] Gold has good oxidation resistance, chemical inertness, low electrochemical migration performance, and gold has high electrical conductivity, so it is widely used in the field of electronic technology, especially in the field of military electronic technology. Gold powder preparation processes mainly include aqueous solution reduction method, polyol reduction method, microemulsion method, spray pyrolysis method, etc. Currently, the range of synthetic particles is generally on the nanoscale. Nanoscale gold powder has a wide range of applications in catalysis, biosensors, fuel cells, etc. Gold powder is mainly used in conductive paste as a functional phase in electronic paste. The gold conductor paste has the advantages of excellent performance, good electrical c...

Claims

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Application Information

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IPC IPC(8): B22F9/24H01B1/02B22F1/145B22F1/148B22F1/065
CPCB22F9/24H01B1/02
Inventor 卢红林梁鹏朱俊杰
Owner 成都市天甫金属粉体有限责任公司
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