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Method for preparing ultrafine platinum powder by adopting liquid-phase reduction

A technology of ultra-fine platinum powder and reduction method, which is applied in the field of liquid-phase reduction preparation of ultra-fine platinum powder, can solve the problems of easy agglomeration of platinum powder and particle size distribution of amorphous structure of platinum powder particles, and achieves good uniformity and convenient silk. Screen printing, the effect of high product purity

Inactive Publication Date: 2012-10-10
GRIKIN ADVANCED MATERIALS
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Problems solved by technology

[0004] The purpose of the present invention is to provide a liquid-phase reduction method for preparing ultrafine platinum powder, which solves the shortcomings of the traditional preparation method that the platinum powder is easy to agglomerate during the generation of ultrafine platinum powder particles, and the platinum powder particles have an amorphous structure and wide particle size distribution.

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  • Method for preparing ultrafine platinum powder by adopting liquid-phase reduction
  • Method for preparing ultrafine platinum powder by adopting liquid-phase reduction
  • Method for preparing ultrafine platinum powder by adopting liquid-phase reduction

Examples

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Embodiment 1

[0026] [embodiment 1] a kind of method that adopts liquid phase reduction method to prepare superfine platinum powder, comprises the following steps:

[0027] (1) Preparation of platinum salt solution: Dissolve chloroplatinic acid in deionized water to prepare 300mL platinum salt solution, wherein the platinum concentration in the platinum salt solution is 150g / L;

[0028] (2) Adjustment of the pH value of the platinum salt solution: Add a sodium hydroxide solution with a concentration of 300g / L to the platinum salt solution dropwise under stirring, so that the pH value of the platinum salt solution is 7;

[0029] (3) Preparation of dispersant: prepare 20mL aqueous solution containing 10wt% glycerol as dispersant;

[0030] (4) Preparation of reducing solution: the reducing solution is an alkaline aqueous solution of hydrazine hydrate, with a volume of 1500mL, in which the concentration of hydrazine hydrate is 40g / L, and the concentration of sodium hydroxide is 30g / L;

[0031]...

Embodiment 2

[0033] [embodiment 2] a kind of method that adopts liquid phase reduction method to prepare superfine platinum powder, comprises the following steps:

[0034] (1) Preparation of platinum salt solution: Dissolve sodium chloroplatinate in deionized water to prepare 300mL platinum salt solution, wherein the platinum concentration in the platinum salt solution is 200g / L;

[0035] (2) Adjustment of the pH value of the platinum salt solution: Add a sodium hydroxide solution with a concentration of 300g / L to the platinum salt solution dropwise under stirring, so that the pH value of the platinum salt solution is 7;

[0036] (3) Preparation of dispersant: prepare 30mL aqueous solution containing 1wt% ethylene glycol as dispersant;

[0037] (4) Preparation of reducing solution: the reducing solution is an alkaline aqueous solution of ascorbic acid, with a volume of 2100mL, to which 21g of ascorbic acid (equivalent to a concentration of 10g / L) and 31.5g of sodium hydroxide (equivalent t...

Embodiment 3

[0040] [embodiment 3] a kind of method that adopts liquid phase reduction method to prepare superfine platinum powder, comprises the following steps:

[0041] (1) Preparation of platinum salt solution: Dissolve platinum dichlorotetraammine in deionized water to prepare 300mL platinum salt solution, wherein the concentration of platinum in the platinum salt solution is 50g / L;

[0042] (2) Adjustment of the pH value of the platinum salt solution: Add a sodium hydroxide solution with a concentration of 300g / L to the platinum salt solution dropwise under stirring, so that the pH value of the platinum salt solution is 2;

[0043] (3) Preparation of dispersant: Prepare 24mL aqueous solution containing 5wt% polyvinyl alcohol as a dispersant;

[0044] (4) Preparation of reducing solution: The reducing solution is an alkaline aqueous solution of formaldehyde and hydrazine hydrate, with a volume of 3000 mL, in which the concentration of formaldehyde is 30 g / L, the concentration of hydra...

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Abstract

The invention relates to a method for preparing ultrafine platinum powder by adopting liquid-phase reduction. The method comprises the following steps: preparing platinum salt solution, and regulating the pH value of the platinum salt solution to be 2-7, dropwise adding the obtained platinum salt solution into mixed solution of a reducing solution and a dispersing agent while mixing, continuing to mix for reaction for 10-30 min after dropwise adding the platinum salt solution, and obtaining ultrafine platinum powder after filtering, washing and drying products generated by reaction, wherein the dispersing agent is aqueous solution of any one or combination of ethylene glycol, glycerin, polyvinyl alcohol and isobutyl alcohol, and the reducing solution is alkaline aqueous solution of any one or combination of formaldehyde, hydrazine hydrate, ascorbic acid, oxalic acid and sodium borohydride. The ultrafine platinum powder prepared by the method has the characteristics of high purity, small particle size, uniform spherical structure, good dispersibility and the like, and can be applied in conductive components of conductive paste and electrode paste with high stability, high reliability and good performance in microelectronic technology.

Description

technical field [0001] The invention relates to a method for preparing ultrafine platinum powder by using a liquid phase reduction method, in particular to a liquid phase reduction preparation method for ultrafine platinum powder in thick film slurry in the electronic industry. The ultrafine platinum powder can be applied to High stability, high reliability, and excellent performance conductive paste and conductive component of catalytic electrode paste in microelectronics technology. Background technique [0002] Ultrafine platinum powder is widely used in the preparation of thick film paste in the electronics industry, such as platinum electrode paste, platinum palladium electrode paste, platinum electrode paste, etc. These pastes can be used to produce catalytic platinum in automotive oxygen sensors and solar cells Electrodes, platinum electrodes for temperature sensors, and other electrodes or wires that require high catalytic activity and high reliability. Ultrafine pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 贺昕陈峤吴松陈斐吴聪李轶轁
Owner GRIKIN ADVANCED MATERIALS
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