PEF Thermoplastic Foams for Wind Turbine Blade Strength
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Solution Overview
Problem
Developing thermoplastic foams that are environmentally friendly, recyclable, and sustainable while maintaining excellent performance properties, such as low density and high mechanical strength, has proven challenging, particularly in applications like wind turbine blades where traditional materials like PET fail to meet strength requirements.
Innovation Solution
The use of polyethylene furanoate (PEF) thermoplastic foams with hydrohaloolefin blowing agents, which form closed-cell structures with enhanced mechanical properties and low density, addressing the limitations of existing polyester-based foams by incorporating ethylene furanoate moieties and specific blowing agents like hydrofluoroolefins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional polyester resins (PET) are used to form foam, then the foam can be produced with low density and good recyclability, but the mechanical strength is insufficient for high-performance applications
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester resin by incorporating PEF (polyethylene furanoate) moieties into the polymer structure. This chemical parameter change results in improved mechanical strength while maintaining the low density and recyclability characteristics of polyester foams, thereby resolving the contradiction between strength and performance reliability.
Solution Approach 2:
The patent creates a composite foam structure by combining PEF-modified polyester resin with blowing agents to form closed-cell foam. This composite approach integrates the structural benefits of polyester with the mechanical enhancements provided by PEF, achieving both high strength and reliable performance in demanding applications.
2Object-affected harmful factors
If environmentally friendly blowing agents are used to reduce GWP, then the environmental impact is reduced, but the foam performance properties may be compromised
Solution Approach 1:
The patent changes the blowing agent parameters by selecting hydrohaloolefins with low GWP values. These blowing agents maintain adequate foam strength and performance properties while significantly reducing the environmental impact, thus resolving the contradiction between environmental friendliness and foam strength.
3Weight of moving object
If the foam density is reduced to achieve lightweight applications, then the weight is reduced, but the mechanical integrity may be compromised
Solution Approach 1:
The patent changes the polymer composition parameters by incorporating PEF moieties, which improve the mechanical strength-to-density ratio. This allows the foam to maintain high mechanical integrity even at reduced densities, resolving the contradiction between lightweight requirements and mechanical strength.
Solution Approach 2:
The patent creates a composite closed-cell foam structure that combines lightweight polyester-PEF resin with gas-filled cells. This composite structure achieves low weight while maintaining mechanical integrity through the closed-cell architecture and enhanced polymer matrix strength.
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 PEF foams offer a sustainable and lightweight solution with improved mechanical strength, suitable for applications like wind turbine blades, while reducing environmental impact through the use of renewable resources and low-GWP blowing agents.
Implementation Method 1
hydrohaloolefin blowing agents, which form closed-cell structures
Data Source
AI summary
Disclosed are foam articles comprising a thermoplastic, closed-cell foam having at least a first surface and comprising: (i) thermoplastic polymer cell walls comprising at least about 0.5% by weight of ethylene furanoate moieties and optionally one or more co-monomer moieties; (ii) blowing agent contained in at least a portion of said closed cells; and a material different than said thermoplastic, closed-cell foam attached to and/or integral with at least a portion of said first foam surface.