Electric-arc resistant face shield or lens including ir-blocking inorganic nanoparticles

a technology of inorganic nanoparticles and face shields, applied in the direction of coatings, mechanical equipment, capacitors, etc., can solve the problems of immediate fatal burns, electric arc flashes, electric arcs that are extremely dangerous for electric workers,

Inactive Publication Date: 2014-09-11
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrical workers are at risk from electric arcs or flashes from high voltage equipment.
Electric arcs are extremely dangerous and the resulting high temperatures can cause injury through burning and can even cause immediate fatal burns.

Method used

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  • Electric-arc resistant face shield or lens including ir-blocking inorganic nanoparticles
  • Electric-arc resistant face shield or lens including ir-blocking inorganic nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022]Cs0.33WO3 tungsten bronze powder can be prepared by homogeneously mixing an aqueous solution of soluble tungsten and cesium salts, e.g. ammonium tungstate and cesium acetate, followed by drying and high temperature treatment in a reducing / inert gas atmosphere to form the final crystalline tungsten bronze nanoparticles.

[0023]A homogenous dispersion of the tungsten nanoparticles are then prepared in a liquid solvent medium, e.g. toluene, using a wet milling method with small diameter grinding media. Typically the milling media would be zirconia-based and have a diameter of less than 0.3 mm. A horizontal wet media mill would be suitable for this application. A dispersing agent, e.g. a polyacrylate, would be typically added at this stage to improve the dispersion of the powder material and to yield a stable solvent dispersion of the nanoparticle. Other materials including inorganic particles, organic dyes, heat stabilizers and UV absorbers can be added at this stage or later.

[0024...

example 2

[0027]Even lower concentrations of tungsten oxide nanoparticles could be used for this application, for example 0.1% by weight and lower.

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Abstract

A transparent electric-arc resistant composition is produced by preparing crystalline tungsten bronze nanoparticles and homogenously dispersing the nanoparticles in a transparent plastic matrix. The crystalline tungsten bronze nanoparticles are prepared by homogeneously mixing an aqueous solution of soluble tungsten and cesium salts and then drying the solution. The dried solution is then heated in a reducing gas or inert gas atmosphere to form crystalline tungsten bronze nanoparticles. Thereafter, a dispersion agent is added and the nanoparticles are dispersed in a liquid solvent medium by wet milling to form a dispersion mixture. The dispersion mixture is then mixed with polymer pellets to form a polymer mixture, and the polymer mixture is then extruded to yield polymer pellets containing highly homogeneously dispersed inorganic nanoparticles. During or after dispersion, additional particles, dyes, heat stabilizers or UV absorbers, may be added. A lens or shield is then molded from the polymer pellets.

Description

BACKGROUND[0001]The present disclosure relates to electric-arc resistant materials and more particularly to electric-arc resistant face shields.[0002]Electrical workers are at risk from electric arcs or flashes from high voltage equipment. Electric arcs are extremely dangerous and the resulting high temperatures can cause injury through burning and can even cause immediate fatal burns. Due to the dangers involved, personal protective equipment is needed for electric arc protection, including helmets and headgear.SUMMARY OF THE DISCLOSURE[0003]The present disclosure relates to electric-arc resistant face shields incorporating IR-blocking nanoparticles.[0004]A transparent plastic composition resistant to an electric arc includes a transparent substrate material and inorganic nanoparticles. The inorganic nanoparticles are dispersed in the substrate so that the composition is substantially transparent. The substrate may be a cellulose-derived material such as cellulose acetate propionat...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A42B3/22
CPCA42B3/225F16P1/06B23K9/322A61F9/022
Inventor BOULTON, JONATHANJOHNSON, PHILIP
Owner HONEYWELL INT INC
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