Amine-Cured Epoxy Elastomer for Subsea Thermal Insulation
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Solution Overview
Problem
Current insulation materials for subsea pipelines and equipment face challenges such as hydrolytic degradation, brittleness, and difficulty in repair, particularly in high-stress and high-temperature environments, which affect their thermal performance and mechanical properties.
Innovation Solution
Development of an amine cured epoxy elastomeric material that combines the processing and mechanical properties of polyurethane elastomers with improved thermal-hydrolytic stability, using a reaction product of epoxy-terminated prepolymer and an amine curing agent, along with glass bubbles to create a syntactic elastomer for enhanced insulation and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane is used for insulation, then mechanical properties and ease of processing are improved, but hydrolytic stability deteriorates
Solution Approach 1:
The patent uses a composite material system combining epoxy resin with amine curing agents to create an elastomeric insulation material that achieves both mechanical strength and hydrolytic stability. The epoxy-amine system forms a crosslinked network that resists hydrolysis while maintaining toughness and flexibility, resolving the contradiction between mechanical properties and hydrolytic stability.
Solution Approach 2:
The patent changes the chemical composition parameters by selecting specific amine curing agents with appropriate molecular weights and functionality to optimize the balance between mechanical properties and hydrolytic resistance. By adjusting the amine-to-epoxy ratio and selecting specific amine structures, the material achieves desired mechanical strength while maintaining stability in hot-wet environments.
2Temperature
If rigid epoxy-syntactic foam is used for insulation, then thermal insulation performance is improved, but mechanical toughness and ease of repair deteriorate
Solution Approach 1:
The patent creates a composite elastomeric material that combines the thermal insulation properties of foam structures with the mechanical toughness of epoxy-amine crosslinked networks. This composite approach maintains low thermal conductivity while providing flexibility and impact resistance, eliminating the brittleness of conventional rigid epoxy-syntactic foams.
Solution Approach 2:
The patent develops a flexible elastomeric insulation material that can conform to complex shapes and withstand mechanical stresses. The epoxy-amine system provides a flexible yet durable coating that can be applied as thin films or molded sections, improving both mechanical toughness and ease of installation compared to rigid foams.
3Reliability
If polypropylene is used for insulation, then hydrolytic stability is improved, but ease of manufacture and mechanical properties deteriorate
Solution Approach 1:
The patent changes the manufacturing approach by using a one-step epoxy-amine curing process that eliminates the need for complex multi-layer extrusion required for polypropylene. The epoxy resin system allows for simpler processing while achieving comparable or superior hydrolytic stability, improving ease of manufacture.
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 material provides effective thermal insulation with high flexibility, resistance to hydrolytic degradation, and ease of application, maintaining mechanical properties across a wide temperature range, including low temperatures and high-stress conditions.
Implementation Method 1
the reaction product of (a) an ambient temperature liquid epoxy-terminated prepolymer formed by reacting one or more polyether-polyamines with a molar excess of epoxide, wherein the polyether-polyamine has at least 3 active hydrogens and (b) a curing agent comprising at least one amine or polyamine having an equivalent weight of less than 200 and having 2 to 5 active hydrogen atoms
Implementation Method 2
the elastomer is utilized to thermally insulate any object from a surrounding fluid
Implementation Method 3
the insulating material is a syntactic elastomer containing glass bubbles produced by the reaction of the epoxy terminated prepolymer and an amine curing agent as described above in the presence of the glass bubbles
Data Source
AI summary
The invention provides an insulation material comprising an epoxy-terminated prepolymer and an amine curing agent. The reaction production of the epoxy-terminated prepolymer and amine curing agent provides for an elastomer that combines the processing and mechanical properties of polyurethane elastomers with improved thermal-hydrolytic stability. The insulation material is particularly useful as thermal insulation and coating for subsea oil and gas applications.