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Low loose density sheet-like silver powder preparation method

A flake silver powder and low porosity ratio technology, which is applied in the field of chemical preparation of electronic powder materials, can solve problems such as loss of metallic luster, silver gray, and increase in zero resistance, and achieve the effect of improving floatability and dispersibility

Inactive Publication Date: 2006-02-22
KUNMING HENDERA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the silver powder is matched with the resin, it is rolled into a slurry and heated and cured. As the curing temperature rises, the silver sheet shrinks, forms granules and becomes thicker, loses metallic luster and becomes silver gray, resulting in an increase in zero resistance, which is not of great practical use. value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Raw materials: the particle size of ultra-fine silver powder is required to be 0.1-1um, and the silver content is 99.96-99.98%;

[0022] 2. Ball milling: Clean the stainless steel tank of the planetary ball mill with deionized water. The volume of the ball mill tank is 3 liters. The diameter of the ball milling medium is 10 kg of agate balls with a diameter of φ4 mm. 1 liter of ethanol, 4 milliliters of liquid lubricant glycerin, 5 grams of ball milling aid zinc stearate, the rotating speed is 200 rpm, and the ball milling time is 8 hours. Clean the silver powder sticking to the ball, and wash the flake silver powder with absolute ethanol for 3 times, filter and wait for a modification;

[0023] 3. Primary surface modification: Weigh 10 grams of polyvinyl alcohol, dissolve it with deionized water, add ionized water to 1 liter, and prepare a primary surface modifier with a concentration of 10 grams per liter. Put 1 kg of silver powder after ball milling, and add into...

Embodiment 2

[0025] Embodiment 2: raw material is identical with example 1;

[0026] Clean the stainless steel tank of the planetary ball mill with deionized water. The volume of the ball mill tank is 10 liters. The diameter of the ball milling medium is 80 kilograms of stainless steel balls with a diameter of φ10 mm. 35 milliliters of terpineol, 70 grams of polyvinylpyrrolidone as a ball milling aid, 400 rpm of rotating speed, 4 hours of ball milling time, take out the slurry in the ball mill tank, filter and separate, and use absolute ethanol to glue the ball on the ball. The silver powder is cleaned, and the gained flaky silver powder is cleaned 3 times with absolute ethanol, and is modified once after filtering; 30 grams of polyvinyl alcohol and 30 grams of polyvinylpyrrolidone are dissolved in deionized water, and added to 3 liters of deionized water to prepare The concentration is 20 grams per liter of primary surface modifier, 3.5 kg of ball-milled silver powder is added to 3 liters...

Embodiment 3

[0027] Embodiment 3: The raw material is the same as in Example 1; a stirring ball mill is adopted, the volume of the ball mill tank is 30 liters, and the diameter of the ball milling medium is 200 kilograms of stainless steel balls of φ 20 mm, 5 kilograms of raw materials, 10 liters of wet grinding medium dehydrated alcohol, liquid 80 milliliters of lubricant terpineol, 50 milliliters of glycerin, 50 grams of polyvinylpyrrolidone, 60 grams of zinc stearate, 600 rpm of rotating speed, 2 hours of ball milling time, and the slurry in the ball milling tank Take it out, filter and separate it, and wash off the silver powder sticking to the ball with absolute ethanol, and wash the obtained flaky silver powder with absolute ethanol for 3 times, and wait for a modification after filtering; weigh 100 grams of polyvinyl alcohol, 100 grams of triethanolamine titanium Sour fat and 100 grams of polyvinylpyrrolidone are dissolved in deionized water, and added to 10 liters of deionized water...

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Abstract

The invention relates to a method for preparation of low apparent density sheet silver powder, which comprises five steps: choosing materials, ball grinding, one- time surface modified, drying, and secondary surface modified. With the silver powder of silver content more than 99.95% and granularity among 0.1- 1um as the material, by wet ball grinding with the existence of mill medium, mill auxiliary agent and liquid lubricant, one- time chemical modification treatment, and one- time dry ball grinding modification treatment, the low apparent density sheet silver powder is prepared. The time of wet ball grinding being among 2- 8h that is 1 / 5 of the time of mechanical ball grinding and the apparent density being only 1 / 2 of that of mechanical ball grinding, with the invented, it solves the problem of deposition and agglomeration in conductive paint; and with twice surface modified treatment, coating two- layer protective film, the first layer being dispersion film and the second being directional floating film, the dispersibility and flotation property of the silver powder are improved, and the silver powder is the required material of producing electromagnetic shielding paint and conductive paint. Every index of the silver powder can satisfy the requirement of conductive paint and shielding pain.

Description

[0001] 1. Technical field: It belongs to the field of chemical preparation of electronic powder materials. 2. Background technology: [0002] With the rapid development of the modern electronics industry, the number of various commercial and household electronic products has increased dramatically. The miniaturization, integration, light weight, and digitization of electronic circuits and components have caused electronic products in daily use to be susceptible to electromagnetic wave interference, resulting in misoperation and image disturbance. At the same time, these electronic products themselves also emit electromagnetic waves, thus forming a public hazard problem of electromagnetic waves. Our daily use of mobile phones, computers, televisions, microwave ovens, etc. all have electromagnetic radiation. When the human body is in the electromagnetic field for a long time, electromagnetic wave radiation can lead to endocrine system disorder and microcirculation imbalance, an...

Claims

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Application Information

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IPC IPC(8): B22F9/04
Inventor 朱晓云郭忠诚
Owner KUNMING HENDERA SCI & TECH
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