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Method for preparing ultrafine silver powder by using waste photographic film

A photosensitive film, ultra-fine silver technology, applied in the direction of improving process efficiency, to achieve the effect of good dispersion, regular shape and uniform particle size

Inactive Publication Date: 2015-05-27
宋鹏
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  • Abstract
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Problems solved by technology

However, the preparation of superfine silver powder by using macromolecule-surfactant composite system as dispersant has not been reported yet.

Method used

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Embodiment Construction

[0022] A kind of method utilizing waste photosensitive film to prepare superfine silver powder: comprise the following steps:

[0023] Step 1: Preparation of raw materials:

[0024] Material: waste film;

[0025] Reagents: nitric acid, sodium chloride, sodium hydroxide, aluminum chloride, sodium carbonate, borax, ammonia, ascorbic acid, polyvinylpyrrolidone (PVP), cetyltrimethylammonium bromide (CTAB), cations Polyacrylamide (PAM), Sodium Dodecyl Sulfate (SDS); Triethanolamine (TEA);

[0026] Instruments: super constant temperature water bath, acidity meter, box-type resistance furnace, magnetic stirrer, high-speed centrifuge, vacuum drying oven, X-ray diffractometer, scanning electron microscope.

[0027] Step 2: Preparation of silver from waste film:

[0028] (1) Add 100 mL of a certain concentration of HN0 3 Add the solution into a 250 mL three-neck flask, start stirring, put 6g of waste film that has been cut into small pieces of substrate, heat it in a constant temper...

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Abstract

The invention relates to the technical field of rare metal materials and engineering and particularly relates to a method for preparing ultrafine silver powder by using a waste photographic film. The method for preparing the ultrafine silver powder by using the waste photographic film comprises the following steps: preparing rough silver salt from a waste film and putting the rough silver salt into a graphite crucible; adding proper amount of sodium carbonate and boric acid; smelting at 1100 DEG C and removing suspended sodium chloride; and cooling and drying to obtain high-purity silver with the content more than 99.5%. The ultrafine silver powder is prepared from the high-purity silver. The waste film is used as a raw material and is immersed with a nitric acid dissolving method to prepare the high-purity silver with the content more than 99.5%; ascorbic acid is used as a reducing agent, and a macromolecule (PVP)-surfactant (TEA) composite system is used as a dispersant so that the spherical ultrafine silver powder with uniform granularity, regular shapes, good dispersity and controllable granularity can be prepared.

Description

technical field [0001] The invention relates to the field of rare metal materials and engineering technology, in particular to a method for preparing superfine silver powder by using waste photosensitive film. Background technique [0002] Ultra-fine silver powder is an emerging functional material, which has the advantages of small particle size, large specific surface area, low melting point, good sintering performance, high activity, and good catalytic activity, while retaining the good electrical conductivity and antibacterial properties of metallic silver. Electroformed silver has bright color and other characteristics, and is widely used as catalyst material, antistatic material, low temperature superconducting material, electronic paste, biosensor material, and functional material for antibacterial, deodorizing and absorbing part of ultraviolet rays. The preparation method of ultra-fine silver powder can be divided into physical method and chemical reduction m...

Claims

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Application Information

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IPC IPC(8): B22F9/24C22B7/00C22B11/00
CPCY02P10/20
Inventor 宋鹏
Owner 宋鹏
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