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Fiber formation by electrical-mechanical spinning

a technology of electrical-mechanical spinning and fibers, applied in the field of fibers, can solve problems affecting the quality and quantity of fibers

Inactive Publication Date: 2009-04-23
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]The present invention provides a method of fiber production starting from a liquid material such as a polymer solution or a polymer melt. The liquid material is fed to an annular rotating member such as a disk or cup rotating around an axis concentric therewith. The rotating member has a relatively smooth continuous surface extending from the central area to a periphery. The liquid material is directed by centrifugal force radially from the central area to the periphery and is expelled from the periphery towards a target. Liquid material is electrically charged either by the rotati

Problems solved by technology

Also adjusting these variables affects the quality and quantity of the fibers.

Method used

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  • Fiber formation by electrical-mechanical spinning

Examples

Experimental program
Comparison scheme
Effect test

example a

[0033]An acrylic-silane polymer was prepared as follows.

[0034]With reference to Table 1 below, a reaction flask was equipped with a stirrer, thermocouple, nitrogen inlet and a condenser. Charge A was then added and stirred with heat to reflux temperature (75° C.-80° C.) under nitrogen atmosphere. To the refluxing ethanol, Charge B and Charge C were simultaneously added over three hours. The reaction mixture was held at reflux condition for two hours. Charge D was then added over a period of 30 minutes. The reaction mixture was held at reflux condition for two hours and subsequently cooled to 30° C.

TABLE 1Example ACharge A (weight in grams)Ethanol SDA 40B1477.5Charge B (weight in grams)Methyl Methacrylate0.2Acrylic acid11.5Silquest A-1742134.42-hydroxylethylmethacrylate45.8n-Butyl acrylate0.2Acrylamide7.2Ethanol SDA 40B206.5Charge C (weight in grams)Vazo 6738.1Ethanol SDA 40B101.7Charge D (weight in grams)Vazo 672.0Ethanol SDA 40B12.0% Solids21.3Acid value (solution)10.51Denatured et...

example b

[0037]An acrylic-silane polymer was prepared as follows.

[0038]With reference to Table 2 below, a reaction flask was equipped with a stirrer, thermocouple, nitrogen inlet and a condenser. Charge A was then added and stirred with heat to reflux temperature (75° C.-80° C.) under nitrogen atmosphere. To the refluxing ethanol, Charge B and Charge C were simultaneously added over three hours. The reaction mixture was held at reflux condition for two hours. Charge D was then added over a period of 30 minutes. The reaction mixture was held at reflux condition for two hours and subsequently cooled to 30° C.

TABLE 2Example ACharge A (weight in grams)Ethanol SDA 40B1288.0Charge B (weight in grams)Methyl Methacrylate16.0Acrylic acid6.9Silquest A-174281.12-hydroxylethylmethacrylate0.1n-Butyl acrylate0.1Glycidyl Methacrylate11.6Ethanol SDA 40B124.5Charge C (weight in grams)Vazo 67349.0Ethanol SDA 40B61.1Charge D (weight in grams)Vazo 671.2Ethanol SDA 40B7.2% Solids18.5Acid value (solution)8.91Dena...

example c

[0040]An inorganic sol gel polymer was prepared as follows.

[0041]Deionized water (36 grams) was placed in a jar, and polyvinyl alcohol (4 grams, Aldrich, Catalog 36311, CAS [9002-89-5], 96% hydrolyzed, and MW 85,000-100,000) was added to the water while stirring magnetically. This mixture was warmed to 80° C. in a hot water bath to affect dissolution. More deionized water (40 grams) was added to this warm aqueous polyvinyl alcohol solution while continuing to stir. To this warm, diluted aqueous polyvinyl alcohol solution was added colloidal silica dispersion (120 grams, MT-ST Silica, Nissan Chemical Industries, LTD., about 30% silica in methanol) while continuing to stir. Viscosity of this polyvinyl alcohol, silica solution was determined to be A− by the method of ASTM-D1545.

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Abstract

A method of fiber formation by electrical-mechanical spinning is disclosed. A liquid starting material is fed to a rotating annular member such as a spinning cup. The liquid material is directed by centrifugal force to the periphery of the annular member where it is expelled in fibrous form. An electric charge is imposed on the liquid while on the annular member or while immediately being expelled from the annular member.

Description

FIELD OF THE INVENTION[0001]The present invention relates to fiber formation, particularly to fibers of nano dimensions.BACKGROUND OF THE INVENTION[0002]Fibers of nano dimensions can be produced by streaming an electrostatically charged liquid such as a polymeric solution through a jet or needle with a very small orifice. Scaling up this process by using multiple needles suffers from the difficulty of electrically isolating these needles from each other. Consequently, needles typically must be at least one centimeter away from the nearest neighbor. In addition, the need to draw a Tailor cone from a single droplet on the end of each needle limits the maximum flow rate per needle and increases the number of needles that are needed to achieve large scale production.[0003]Therefore, there is a need for a process to manufacture fibers of nano dimensions with high throughput without the need for multiple applicators. The present invention provides such a process.SUMMARY OF THE INVENTION[0...

Claims

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Application Information

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IPC IPC(8): D01D5/08D06M10/00D04H1/728
CPCD01D5/0069D01F6/18D01D5/18D01D5/0985
Inventor HELLRING, STUART D.CAMPBELL, MELANIE S.MUNRO, CALUM H.
Owner PPG IND OHIO INC
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