Composite Coating Structure for Hydrolysis-Resistant Subsea Insulation
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Solution Overview
Problem
Subsea pipelines and structures face challenges with insulation due to temperature differences between hot petroleum fuels and cold seawater, leading to viscosity issues, wax formation, and hydrate clogging, with existing coatings exhibiting poor adhesion and hydrolysis resistance.
Innovation Solution
A composite article with a low surface energy polymer, a poly(meth)acrylate layer formed with an organoborane initiator, an epoxide layer, and a hydrolytically resistant polyurethane elastomer layer, which are sequentially applied to provide improved insulation, adhesion, and resistance to seawater exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a polymer patch is applied to insulate subsea pipelines after welding, then insulation continuity is achieved, but adhesion strength and hydrolysis resistance deteriorate
Solution Approach 1:
The coating system is divided into multiple functional layers: a primer layer for adhesion to the metallic substrate, an intermediate insulation layer, and a protective outer layer. This segmentation allows each layer to optimize for its specific function, with the primer ensuring strong bond to the pipe and the insulation layer providing thermal protection while resisting hydrolysis.
Solution Approach 2:
The patent employs composite coating materials combining organic polymers with inorganic additives to achieve both adhesion and hydrolysis resistance. The composite formulation includes crosslinking agents and hydrolysis-resistant compounds that work synergistically to maintain coating integrity in the harsh subsea environment while providing continuous insulation.
2Productivity
If subsea pipelines are insulated to maintain fuel temperature, then fuel flow efficiency is improved, but construction complexity increases due to multiple coating layers
Solution Approach 1:
The patent combines adhesion promotion and hydrolysis resistance functions into integrated coating layers rather than requiring separate treatments. The primer layer inherently provides both bonding to the substrate and resistance to water penetration, while the insulation layer is formulated with hydrolysis-resistant materials that simultaneously provide thermal protection and environmental resistance, reducing the number of discrete construction steps.
Solution Approach 2:
The coating system is designed with specific parameter ranges for thickness, crosslinking density, and material composition that optimize both insulation performance and construction efficiency. By controlling these parameters within defined ranges, the patent achieves effective thermal insulation while maintaining practical applicability and reducing construction complexity through standardized formulation and application procedures.
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 composite coating maintains the integrity of petroleum fuels by preventing excessive viscosity and clogging, while retaining high peel strength and hydrolytic resistance, ensuring efficient flow and prolonged structural integrity in harsh subsea conditions.
Implementation Method 1
The curing agent crosslinks the carbon-carbon double bonds of the polydiene polyol
Implementation Method 2
the reaction product of at least one (meth)acrylate that is polymerized in the presence of an organoborane initiator
Data Source
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AI summary
A composite article includes a low surface energy polymer layer, a poly(meth)acrylate layer, an epoxide layer, and a hydrolytically resistant layer. The poly(meth)acrylate layer is disposed on and in direct contact with the low surface energy polymer layer and includes the reaction product of at least one acrylate that is polymerized in the presence of an organoborane initiator, such that the poly(meth)acrylate includes boron. The epoxide layer is disposed on and in direct contact with the poly(meth)acrylate layer. The hydrolytically resistant layer is disposed on and in direct contact with the epoxide and is the reaction product of an isocyanate component and an isocyanate-reactive component reacted in the presence of a curing agent. The isocyanate- reactive component includes a polydiene polyol and the curing agent crosslinks the carbon- carbon double bonds of the polydiene polyol.