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Method for preparing dispersive submicron honeycomb-shaped spherical platinum powder

A sub-micron, honeycomb-like technology, applied in the field of chemical liquid-phase reduction of platinum precursors for sub-micron honeycomb spherical platinum powder, can solve the problem of the particle size distribution range of the amorphous structure of platinum powder particles, and the tendency of ultra-fine platinum powder to harden. Agglomeration and other problems, to achieve the effect of narrow particle size distribution, low cost and convenient screen printing

Active Publication Date: 2015-04-29
昆明铂生金属材料加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a process for preparing dispersed submicron honeycomb spherical platinum powder, which solves the problem of hard agglomeration, amorphous structure and particle size distribution of platinum powder particles in the traditional preparation method. Disadvantages such as wide range

Method used

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  • Method for preparing dispersive submicron honeycomb-shaped spherical platinum powder
  • Method for preparing dispersive submicron honeycomb-shaped spherical platinum powder
  • Method for preparing dispersive submicron honeycomb-shaped spherical platinum powder

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Preparation of dispersant solution: configuration 300ml dissolved 1.56g Aqueous solution of gum arabic as dispersant;

[0029] (2) Preparation of dispersed submicron-sized honeycomb spherical platinum powder: under stirring, Magrus salt (the concentration of platinum is 60g / L ) into the dispersant solution in step (1), then add concentrated ammonia water drop by drop and heat up, with vigorous stirring to dissolve the Magrus salt, stop adding concentrated ammonia water, and then add it all at once 14g Ascorbic acid, continue to stir the reaction after adding 30~50min , and finally adjust the reaction solution pH value to strong acidity, continue to heat up to 90 ℃, and stirred for a period of time, the product produced by the reaction was filtered, washed twice with water and acetone, and finally vacuum-dried to obtain dispersed submicron honeycomb spherical platinum powder;

[0030] The submicron honeycomb-shaped platinum powder particles prepared in this e...

Embodiment 2

[0032] (1) Preparation of dispersant solution: configuration 300ml dissolved 0.78g Aqueous solution of gum arabic as dispersant;

[0033] (2) Preparation of dispersed submicron honeycomb spherical platinum powder: under stirring, add Magreus salt to the step (the concentration of platinum is 60g / L ) into the dispersant solution in (1), then add concentrated ammonia water drop by drop and heat up, with vigorous stirring to dissolve the Magrus salt, and stop adding concentrated ammonia water. Add it all at once 14g Ascorbic acid, continue to stir the reaction after adding 30~50min , and finally adjust the reaction solution pH value to strong acidity, continue to heat up, and stir for a period of time, filter the product produced by the reaction, wash it twice with water and acetone, and finally dry it in vacuum to obtain dispersed submicron spherical platinum powder;

[0034] The submicron honeycomb-shaped platinum particles prepared in this embodiment are uniform spheri...

Embodiment 3

[0036] (1) Preparation of dispersant solution: configuration 200ml dissolved 1.5g Aqueous solution of Pluronic F127 as dispersant;

[0037](2) Preparation of dispersed submicron honeycomb spherical platinum powder: Potassium chloroplatinite (platinum salt concentration of 50g / l ) into the dispersant solution in step (1), and then quickly complete the addition 200ml Concentration is 88% of formic acid, continue to stir the reaction after adding 30~50min , and finally adjust the reaction solution pH value to strong acidity, continue to heat up, and stir for a period of time, filter the product produced by the reaction, wash it twice with water and acetone, and finally dry it in vacuum to obtain dispersed submicron spherical platinum powder;

[0038] The submicron honeycomb-shaped platinum particles prepared in this example are ellipsoidal or nearly spherical, with an average particle diameter of 70nm , no agglomeration, good dispersion.

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Abstract

The invention discloses a method for preparing dispersive submicron honeycomb-shaped spherical platinum powder. By applying the method, the platinum powder with good dispersity, narrow particle size distribution range and submicron granularity range (controllable granularity between 40-80nm) can be prepared, the morphology of the platinum powder is of a uniform honeycomb-shaped spherical structure, and the specific surface area is greatly increased; the method disclosed by the invention is universal and is low in cost; according to the method disclosed by the invention, a reaction precursor is Magnus (green) salt and the like, a dispersant is an aqueous solution of gum Arabic and the like, and a reducing agent is ascorbic acid and the like; the dispersive submicron honeycomb-shaped spherical platinum powder is obtained through the steps of adding a platinum salt into a dispersant solution in a normal-temperature stirred state, then, adding stronger ammonia water, heating, dissolving the platinum salt along with intensive stirring, finally, adding the reducing agent, continuing to stir and react for 30-50 minutes after the reducing agent is added completely, adjusting the pH value to be strongly acidic, and filtrating, washing and drying a reaction product.

Description

technical field [0001] The invention relates to a process method for preparing dispersed submicron-sized honeycomb spherical platinum powder and a chemical liquid phase reduction platinum precursor. It has a wide range of applications in medicine. Background technique [0002] The catalytic and adsorption properties of submicron honeycomb spherical platinum powder are not only related to their chemical properties, but also related to their size, shape, dispersion, and the structure of individual particles. For example, submicron-sized honeycomb spherical platinum powder is used as the main functional phase in platinum conductor paste and resistance paste, and its performance will have a significant impact on the fluidity, uniformity, and thixotropy of the paste. Porous honeycomb spherical shape, which further increases its specific surface area and enhances the use of the product as an electronic component. Platinum powder is mainly used in the preparation of thick film pas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 刘鸾苏林赵娜孔令彦王玉天王开军胡劲
Owner 昆明铂生金属材料加工有限公司
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