High-Viscosity PTFE Electrospinning for Stable Fiberization

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Solution Overview

Problem

Existing electrospinning processes for polytetrafluoroethylene (PTFE) are limited by low viscosity constraints, leading to inadequate fiberization and orifice clogging, which restricts the production of high-quality PTFE materials with desirable mechanical integrity and properties.

Innovation Solution

A process that increases the viscosity of PTFE dispersions to at least 50,000 cP by using a fiberizing polymer like polyethylene oxide, allowing for electrostatic spinning into high-viscosity mats with improved mechanical properties, using a charge source and target setup to collect and sinter the fibers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the viscosity of PTFE dispersion is increased to improve fiberization quality, then fiber formation quality improves, but orifice clogging occurs and manufacturing reliability deteriorates

Engineering Contradiction:

Improvefiberization qualityVSAvoidorifice clogging

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent changes the viscosity parameter from the conventional low range (<150 poise) to a high range (50,000-300,000 cP) to improve fiberization quality. This parameter change enables better mechanical integrity and reduced fibril breakage while overcoming previous limitations through careful selection of fiberizing polymers and processing conditions.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If low viscosity polymer solution is used to prevent orifice clogging, then manufacturing reliability improves, but fiberization quality becomes inadequate

Engineering Contradiction:

Improveorifice clogging preventionVSAvoidfiberization quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent fundamentally changes the viscosity parameter from low (<150 poise) to high (50,000-300,000 cP) range, demonstrating that high viscosity materials can be successfully electrospun with improved fiberization quality, mechanical integrity, and reduced fibril breakage.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite formulations combining PTFE with fiberizing polymers (such as polyethylene oxide) in high viscosity dispersions. This composite approach enables the system to achieve both high viscosity for quality fiberization and sufficient flow properties to prevent orifice clogging during electrospinning.

Inventive Principle:

Principle #40Composite materials

3Strength

If high viscosity dispersion is used to improve mechanical integrity, then product quality improves, but processing difficulty increases

Engineering Contradiction:

Improvemechanical integrityVSAvoidprocessing difficulty

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent employs composite materials combining PTFE with fiberizing polymers in high viscosity dispersions. This composite formulation achieves superior mechanical integrity and reduced fibril breakage while maintaining processability through careful selection of polymer types and concentrations.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the viscosity parameter to a high range (50,000-300,000 cP) and optimizes related parameters such as polymer molecular weight, concentration, and electrospinning conditions to balance mechanical integrity with processing ease.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The process enables the production of PTFE mats with superior mechanical integrity, reduced fibril breakage, and enhanced manufacturing efficiency, overcoming previous limitations of low viscosity and orifice clogging, resulting in high-quality non-woven sheets and coatings.

Implementation Method 1

A voltage source is provided which creates a first charge at the charge source and an opposing charge at the target. The dispersion is electrostatically charged by contact with the charge source.

Methodology Applied

Scientific EffectElectrostatic attraction: Electrostatics

Implementation Method 2

The electrostatically charged dispersion is collected on the target to form a mat precursor

Methodology Applied

Scientific EffectElectrostatic deposition: Electrostatic Deposition

Implementation Method 3

The mat precursor is heated to remove the solvent and the fiberizing polymer thereby forming the PTFE mat

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS8178030B2Electrospinning of PTFE with high viscosity materials

Publication Date: 2012.05.15 ZEUS CO LLC

AI summary

An improved process for forming a PTFE mat is described. The process includes providing a dispersion with PTFE, a fiberizing polymer and a solvent wherein said dispersion has a viscosity of at least 50,000 cP. An apparatus is provided which comprises a charge source and a target a distance from the charge source. A voltage source is provided which creates a first charge at the charge source and an opposing charge at the target. The dispersion is electrostatically charged by contact with the charge source. The electrostatically charged dispersion is collected on the target to form a mat precursor which is heated to remove the solvent and the fiberizing polymer thereby forming the PTFE mat.