Epoxy Thermal Insulating Coating for Corrosion Under Insulation
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Solution Overview
Problem
Existing solutions for mitigating corrosion under insulation (CUI) are ineffective, costly, and difficult to apply, particularly in critical areas, and there is a need for a composition that provides long-term protection, low thermal conductivity, enhanced corrosion resistance, and ease of application.
Innovation Solution
A composition comprising 20-60 wt.% epoxy resin, 10-30 wt.% curing agent, 1-15 wt.% glass microspheres, 10-40 wt.% corrosion-resistant fillers, 0.1-1.0 wt.% fluorine-containing dispersant, and 10-40 wt.% solvent, which is applied as a coating on metallic surfaces to mitigate CUI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective coatings (organic coatings, thermal spray aluminum, Al-foil wrapping) are used for CUI mitigation, then corrosion protection is provided, but cost increases significantly and application becomes difficult in critical bent areas
Solution Approach 1:
The patent modifies the chemical composition parameters of protective coatings by incorporating specific ratios of epoxy resin, polyester resin, vinyl acetate, and plasticizers to achieve optimal flexibility and adhesion. This allows the coating to conform to complex geometries including bent areas while maintaining corrosion protection efficacy
Solution Approach 2:
The invention uses composite coating formulations combining multiple resin systems (epoxy, polyester, vinyl acetate) with specific additives and plasticizers to create a multi-functional coating that provides both corrosion protection and flexibility for difficult-to-reach areas
2Reliability
If thick insulative coatings are applied to prevent moisture ingress, then corrosion protection improves, but thermal conductivity increases and energy loss occurs
Solution Approach 1:
The patent incorporates porous or hollow filler particles within the coating matrix to reduce thermal conductivity. These porous structures create air gaps that impede heat transfer while maintaining coating integrity and corrosion protection capabilities
Solution Approach 2:
The coating formulation combines organic resin matrices with inorganic fillers and porous structures to create a composite material that simultaneously provides corrosion barrier properties and thermal insulation, minimizing energy loss
3Reliability
If existing CUI mitigation solutions are implemented, then some protection is achieved, but long-term effectiveness is insufficient and maintenance costs remain high
Solution Approach 1:
The patent applies preliminary surface treatment and priming layers before the main protective coating to ensure long-term adhesion and corrosion resistance. This multi-stage approach creates a durable protective system that maintains effectiveness over extended service periods
Solution Approach 2:
The use of composite coating systems with multiple resin types and cross-linking agents creates a more chemically stable and mechanically durable protective layer that resists degradation from environmental exposure, extending service life
4Reliability
If surface preparation and modification are performed to enhance coating adhesion, then corrosion protection improves, but process complexity and cost increase
Solution Approach 1:
The coating formulation contains self-priming components and adhesion promoters that automatically bond to metal surfaces without requiring extensive external surface preparation. The coating system performs its own surface conditioning function, simplifying the application process
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 effectively mitigates CUI up to 120°C, maintains mechanical properties, reduces thermal conductivity, and is cost-effective with no pre-treatment required, offering enhanced protection and stability.
Implementation Method 1
The coating is designed for ultra-high-build (UHB) over 20000 microns (800 mils)
Implementation Method 2
Component A primarily comprises a novolac epoxy resin, epoxy organic silicon resin, and flaky filler, whereas component B includes high functionality amine curing agent
Implementation Method 3
0.1 wt.% to 1.0 wt.% of a fluorine-containing dispersant
Implementation Method 4
A fiber optical Doppler sensor is used for inspecting the corrosion in piping
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a composition for mitigating corrosion under insulation, said composition comprising: (a) 20 wt.% to 60 wt.% of an epoxy resin; (b) 10 wt.% to 30 wt.% of a curing agent comprising a mixture of (b1) an aromatic compound selected from the following formula wherein, Y is an alkyl group containing 1 to 4 carbon atoms, X is hydrogen or an alkyl group containing 1 to 4 carbon atoms, and R and R', independent of each other, are selected from alkyl group containing 1 to 4 carbon atoms, and alkylthio group containing 1 to 4 carbon atoms, and (b2) an aliphatic compound; (c) 1.0 wt.% to 15 wt.% of glass microspheres; (d) 10 wt.% to 40 wt.% of corrosion resistant fillers; (e) 0.1 wt.% to 1.0 wt.% of a fluorine-containing dispersant; and (f) 10 wt.% to 40 wt.% of a solvent, wherein the wt.% is based on the total weight of the composition. The present disclosure also relates to a process for preparing the composition for mitigating corrosion under insulation.