Emeraldine Base Composite Corrosion Inhibition

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Solution Overview

Problem

Conducting polyaniline-based coatings for corrosion protection face issues due to dopant release, which weakens the coating over time, and existing composites often form non-contiguous films, failing to provide complete surface coverage and adequate corrosion inhibition.

Innovation Solution

The use of an insulating form of polyaniline, known as emeraldine base, in a composite with inorganic or organic materials forms a core-shell structure, eliminating dopant release and ensuring complete surface coverage, thereby enhancing corrosion resistance and barrier properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conducting polyaniline is doped with polymeric dopant to induce dispersibility, then dispersibility in aqueous and organic systems is improved, but dopant release over time occurs which weakens the coating

Engineering Contradiction:

ImprovedispersibilityVSAvoidcoating strength

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent extracts the dopant component from the final coating structure by using emeraldine base (undoped polyaniline) instead of doped polyaniline. The base form is processed with dispersants during manufacturing to achieve dispersibility without incorporating permanent dopant ions that would later release and weaken the coating.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses processing aids and dispersants during manufacturing that are temporarily present to enable fabrication, but are not permanently retained in the final coating structure. This allows easy manufacture during production while avoiding long-term reliability issues from retained dopants.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If conducting polyaniline composite is used for corrosion protection, then corrosion inhibition is improved, but non-contiguous film formation occurs which fails to provide complete surface coverage

Engineering Contradiction:

Improvecorrosion inhibitionVSAvoidsurface coverage

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent changes the electrical conductivity parameter of polyaniline from conducting to insulating by using the emeraldine base form instead of the doped conducting form. This parameter change enables complete film formation and controllable dispersion in the coating matrix, ensuring contiguous surface coverage while maintaining corrosion inhibition through barrier protection.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent achieves homogeneous distribution of polyaniline throughout the coating matrix by using the base form with appropriate dispersants, ensuring uniform surface coverage. This homogeneous distribution prevents the non-contiguous film formation that occurs with aggregated conducting polyaniline particles.

Inventive Principle:

Principle #33Homogeneity

3Area of stationary object

If doped polyaniline is used to provide complete surface coverage, then surface coverage is improved, but dopant release causes internal stress that weakens the coating

Engineering Contradiction:

Improvesurface coverageVSAvoidcoating strength

Core Design Contradiction:

Area of stationary objectVSStrength

Solution Approach 1:

The patent extracts the source of internal stress by eliminating dopant ions from the coating structure. The emeraldine base form does not contain ionizable dopants that would release over time and cause internal stress, while still achieving complete surface coverage through proper dispersion and film formation.

Inventive Principle:

Principle #2Taking out (Extraction)

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 emeraldine base composite provides superior corrosion resistance and increased strength when added to coatings, outperforming traditional filler materials by maintaining effectiveness over time and ensuring complete surface coverage.

Implementation Method 1

The polymer coating acts as a dense, physical barrier to the corrosive species, preventing them from reaching the metal surface and consequently protecting metal structure from corrosion

Methodology Applied

Scientific EffectPhysical barrier: Absorption (physical)

Implementation Method 2

The emeraldine base composite, added to a coating applied on to a metal substrate, at least inhibits corrosion and/or acts as filler material that increases strength and barrier properties of the coating layer on the metal surface

Methodology Applied

Scientific EffectComposite materials: Composite Materials

Data Source

PatentUS11208567B2Emeraldine base composite for corrosion inhibition

Publication Date: 2021.12.28 SAS NANOTECHNOLOGIES LLC

AI summary

The present invention relates to an emeraldine base composite, its preparation, and use as an effective anticorrosive pigment additive for corrosion inhibition. The emeraldine base composite comprises an insulating form of polyaniline or its derivatives adhered to an inorganic or organic material substrate such that the emeraldine base covers from about 1-100% surface of the material. Inter alia, the emeraldine base composite can be added to a coating as an anticorrosive pigment additive that inhibits corrosion and as a filler material that increases strength and barrier properties of coating.