Amorphous Polymer Corrosion Coating for Submerged Articles
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Solution Overview
Problem
Existing corrosion protection methods for submerged and partially submerged articles are inadequate due to the use of rigid, hard-sealing polymers that fail under mechanical stress and have limited temperature range, requiring separate compositions for above and below water applications, and are environmentally harmful.
Innovation Solution
A composition comprising an amorphous polymer with a glass transition temperature of -20°C or less and a water-absorbing filler with 20% or higher water absorption, which forms a flexible, adhesive barrier suitable for dry, moist, wet, immersed, or submerged environments without the need for extensive surface pretreatment, and can be applied with a mechanical protective layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid, hard-sealing polymer compositions are used for corrosion protection, then a seal is provided, but the composition splits or tears under mechanical stress and has poor adhesion to metal surfaces
Solution Approach 1:
The patent changes the fundamental parameters of the polymer composition by using amorphous polymers with glass transition temperatures of -20°C or less (such as polyisobutene, polybutene, butyl rubber) instead of rigid thermosetting polymers. This parameter change transforms the material from rigid and brittle to flexible and elastic, enabling it to maintain adhesion and resist mechanical stress while providing effective corrosion protection.
Solution Approach 2:
The invention creates a composite material system combining specific amorphous polymers with water-absorbing fillers (such as bentonite, attapulgite, or calcium carbonate). This composite formulation enhances both the adhesion properties and mechanical flexibility of the coating, resolving the contradiction between seal effectiveness and resistance to mechanical stress.
2Reliability
If separate compositions are used for above-water and below-water applications, then each composition can be optimized for its specific environment, but the device complexity and application process are increased
Solution Approach 1:
The patent develops a universal corrosion protection composition based on amorphous polymers with low glass transition temperatures that can be applied in all environments (dry, moist, wet, immersed, or submerged) and across a wide temperature range (-20°C to 70°C). This single composition replaces the need for separate above-water and below-water compositions, simplifying the application process while maintaining environmental suitability through its flexible, adhesive properties and water-absorbing filler content.
3Reliability
If cured, rigid polymer compositions are used, then a protective seal is formed, but the material is harmful to the environment and difficult to remove for repairs or inspections
Solution Approach 1:
The patent employs non-curing, thermoplastic amorphous polymer compositions that remain flexible and can be easily removed when repairs, replacements, or inspections are needed. While the composition provides effective corrosion protection during service, it can be readily eliminated when no longer needed, replacing permanent, environmentally harmful cured polymers with a removable, environmentally friendly alternative.
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 composition provides improved adhesion, thermal stability, and self-healing properties, allowing for a single solution for both above and below water applications, reducing environmental impact and simplifying application and inspection processes.
Implementation Method 1
a water-absorbing filler having a water-absorption of 20 wt. % or higher as determined according to the procedure described in standard EN-ISO 10769:2011
Data Source
AI summary
The invention provides a composition for the protection against corrosion of an article, wherein the composition comprises an amorphous polymer composition and a water-absorbing filler. The invention further provides a tape comprising the composition of the invention and an article comprising said tape or composition. The invention also relates to a process for the protection against corrosion of an article.