Method for preparing silicon dioxide coating type water aluminum-silver slurry

A technology of silica and aluminum silver paste, applied in chemical instruments and methods, pigment paste, inorganic pigment treatment, etc., to achieve excellent acid and alkali resistance, good product quality, and convenient manufacture

Inactive Publication Date: 2010-09-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the prepared product still has a small amount of hydrogen evolution, it shows that the compactness of the coating film of this method needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Add 40g oily aluminum silver paste filter cake (d50=10.5 μ m) in glass reactor, add 80g diethylene glycol butyl ether, stir well; Add the mixed solution of 20g water and 100g ethanol, stir well; Add 0.13g of aluminum trichloride, after stirring for 30 minutes, the temperature was raised to 60°C, and the temperature was maintained at 60±2°C; 50g of the ethanol solution of 25% tetraethyl orthosilicate prepared in advance was added to the reactor by dropwise addition. Adding time is 4 hours, while adding dropwise, adjust the pH value of the solution in the reactor with 4% ammonia water ethanol solution, make pH maintain at 8.2 ± 0.1, after dropwise addition is completed, continue to react for 3 hours, then cool, After filtering, a silica-coated water-based aluminum-silver paste sample was obtained.

Embodiment 2

[0025] Embodiment 2: Add 40g oily aluminum silver paste filter cake (d50=32.8 μ m) in glass reactor, add 70g diethylene glycol butyl ether, stir evenly; Add the mixed solution of 20g water and 100g ethanol, stir evenly; Add 0.11g of aluminum trichloride, after stirring for 30 minutes, the temperature was raised to 60°C, and the temperature was maintained at 60±2°C; 38g of the ethanol solution of 25% tetraethyl orthosilicate prepared in advance was added to the reactor by dropwise addition. Adding time is 3 hours, while adding dropwise, adjust the pH value of the solution in the reactor with 4% ammonia water ethanol solution, make pH maintain on 8.2 ± 0.1 After dropwise addition is completed, continue to react for 3 hours, then cool, After filtering, a silica-coated water-based aluminum-silver paste sample was obtained.

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PUM

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Abstract

The invention discloses a preparation process of silica dioxide coated waterborne aluminum paste. The characteristics of the process are that self-assembling silica dioxide gel particle, conducting the electric potential regulation and control for the surface of aluminum powder in order to make the surface of aluminum powder positive, generating negative charged SiO2 gel particles through dripping silicon alkoxide to generate silicon alkoxide, wherein negative charged SiO2 gel particles are evenly compactly absorbed on the positive charged aluminum paste surface which is regulated and controlled by aluminum salt, therefore realizing the self-assemly of the SiO2 gel particle on the surface of aluminum powder, and making the surface of aluminum powder be coated with a layer of even compact and transparent silica dioxide film, and finally obtaining silica dioxide coated waterborne aluminum paste. The waterborne aluminum paste has the following characteristics of excellent dispersion in alcohol solvent and water solvent, wonderful properties of acid resistance and alkali resistance, and the particle diameter change of aluminum powder is smaller than 1 micron back and forth coating, and metal sense decrease is smaller 5%. The product of silica dioxide coated waterborne aluminum paste which is prepared can be used as an environment-friendly metallic pigment which can be extensively applied on environment-friendly waterborne pigment and waterborne ink.

Description

technical field [0001] The invention relates to a preparation method of silica-coated water-based aluminum-silver paste. Background technique [0002] Aluminum silver paste is the most widely used metallic pigment with silver-gray metallic luster. Most of its manufacturing methods adopt the method of wet ball milling. The raw material is spherical or nearly spherical spray metal aluminum powder. In addition to adding lubricants such as erucic acid and oleic acid and other additives, mineral oil, 200# solvent oil and other organic materials are also added. solvent. The ball milling medium is 1-5mm steel balls. The ball milling time is about 8 to 30 hours. Through ball milling, the spherical metal aluminum powder is extended into flake metal aluminum powder, showing a silver-gray metallic luster. The flaky aluminum powder after ball milling is sieved to make the particle size of the product more uniform, and then the filter cake is obtained through solid-liquid separation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/06C09D17/00
Inventor 叶红齐张赢超刘辉周永华杨鹰
Owner CENT SOUTH UNIV
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