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Silver plated hollow glass micro bead and its surface silver plating process

A technology of hollow glass microspheres and processing technology, which is applied in the preparation of core-shell structure composite materials and electromagnetic shielding composite materials, and can solve problems such as cumbersome process steps

Inactive Publication Date: 2007-06-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process steps are cumbersome and generally use expensive SnCl 2 and PdCl 2 sensitizer and activator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 2 g of hollow glass microspheres to 250 mL of 2% NaOH solution, stir at 50° C. for 1 h, then filter and wash. Prepare 220mLAgNO in a container 3 (0.05mol / L) solution, slowly add ammonia water dropwise under stirring, until the formed precipitate just dissolves completely and becomes a transparent solution, add the previously treated hollow glass microspheres to the solution, stir for 1 hour, then heat to 50°C, Use an ultrasonic cleaner to disperse it, and after dispersing for 5 minutes, add a mixed solution of 55 mL of absolute ethanol and 1.25 mL of formaldehyde into the solution while stirring with a magnetic stirrer. After reacting for 20 minutes, the silver-plated hollow glass beads were filtered, washed, and dried in an oven at 80°C. The volume resistivity of the prepared silver-coated hollow glass microspheres was 4.193Ω·cm.

Embodiment 2

[0020] Add 2 g of hollow glass microspheres to 250 mL of 2% NaOH solution, stir at 50° C. for 1 h, then filter and wash. Prepare 220mLAgNO in a container 3 (0.05mol / L) solution, slowly add ammonia water dropwise under stirring, until the precipitate formed earlier just dissolves completely and becomes a transparent solution, add the previously treated hollow glass microspheres to the solution, stir for 30min, then heat to 70°C, Use an ultrasonic cleaner to disperse it, and after dispersing for 5 minutes, add a mixed solution of 55mL of absolute ethanol and 1.25mL of formaldehyde into the solution while stirring with a magnetic stirrer. After reacting for 20 minutes, the silver-plated hollow glass beads were filtered, washed, and dried naturally. The volume resistivity of the prepared silver-coated hollow glass microspheres was 4.820Ω·cm.

Embodiment 3

[0022] Add 2g hollow glass microspheres to 250mL mass fraction 5%Na 2 CO 3 solution, stirred at 70°C for 30 min, then filtered and washed. Prepare 220mLAgNO in a container 3 (0.05mol / L) solution, slowly add ammonia water dropwise under stirring, until the formed precipitate just dissolves completely and becomes a transparent solution, add the previously treated hollow glass microspheres into the solution, stir for 1 hour, then heat to 50°C, Use an ultrasonic cleaner to disperse it, and after dispersing for 5 minutes, add a mixed solution of 55mL of absolute ethanol and 1.25mL of formaldehyde into the solution while stirring with a magnetic stirrer. After reacting for 20 minutes, the silver-plated hollow glass beads were filtered, washed, and dried in an oven at 80°C. The volume resistivity of the prepared silver-coated hollow glass microspheres was 5.204Ω·cm.

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PUM

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Abstract

The present invention discloses silver plated hollow glass bead and its surface sliver plating process. The technological process includes soaking hollow glass bead in alkaline solution to clean, roughen and surface hydroxylate; soaking the treated hollow glass bead in argentamine white stirring and heating to react for certain time, and adding reductant to activate and silver plate the hollow glass bead. Compared with traditional technology, the present invention has the advantages of simplified pre-treatment, shortened production period and low cost. The prepared silver plated hollow glass bead has excellent conducting performance and may be used as electromagnetic shielding material.

Description

technical field [0001] The invention belongs to the technical field of preparation of core-shell structure composite materials, relates to silver-plated hollow glass microspheres with a core-shell structure and its preparation technology, and in particular provides a surface silver-plating treatment process for hollow glass microspheres. Silver hollow glass microspheres have excellent electrical conductivity and can be used in the field of electromagnetic shielding composite materials. Background technique [0002] With the rapid development of science and technology such as radar, microwave communication, and electronic countermeasures, the problem of electromagnetic interference (EMI) is becoming more and more serious. In order to achieve electromagnetic wave protection, electromagnetic shielding materials are developing rapidly, and are more and more valued by the majority of material researchers. Among them, electromagnetic shielding conductive coating has the advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/06
Inventor 曹晓国张海燕
Owner GUANGDONG UNIV OF TECH
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