Polyurethane/Polyisocyanurate Sandwich Panels for 210°C Stability
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Solution Overview
Problem
Current polyurethane-based sandwich panels are not capable of withstanding high temperatures, leading to defects such as irreversible swelling or surface blistering, limiting their use in automotive applications requiring exposure to high temperatures.
Innovation Solution
A reaction mixture comprising a polyol, polyisocyanate, catalyst, blowing agent, and optionally chain extenders or crosslinking agents, with an isocyanate index greater than 200, is used to produce polyurethane/polyisocyanurate sandwich panels, which are molded at temperatures between 100°C and 160°C to achieve high temperature stability up to 210°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polyurethane-based sandwich panels are used, then they provide light weight and stiffness, but they exhibit irreversible swelling or surface blistering when exposed to high temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the polyurethane reaction mixture by increasing the isocyanate index to greater than 200 and adjusting the ratio of polyol to polyisocyanate. This chemical parameter modification results in a cured foam with enhanced thermal stability that resists swelling and blistering at temperatures up to 210°C while maintaining the desired light weight and stiffness properties
Solution Approach 2:
The patent creates a composite material system combining specific polyols, polyisocyanates, catalysts, and blowing agents in optimized proportions. The high isocyanate index creates a crosslinked polymer network that forms a composite structure with improved thermal resistance, allowing the sandwich panel to withstand high temperatures without compromising structural integrity
2Temperature
If the isocyanate index is increased to greater than 200, then high temperature stability is achieved, but the reaction mixture formulation becomes more complex
Solution Approach 1:
The patent establishes specific parameter ranges for the reaction mixture components: isocyanate index > 200, polyol to polyisocyanate ratio within specific ranges, and defined catalyst and blowing agent concentrations. By defining these parameter boundaries, the complex formulation process is standardized and reproducible, making the enhanced thermal stability achievable through controlled parameter adjustment rather than complex multi-component synthesis
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 resulting panels exhibit high temperature stability, allowing their use in automotive structural parts like roofs, hoods, and liftgates during vehicle assembly.
Implementation Method 1
A polyurethane-forming reaction mixture is applied to at least one side of the semi-finished sandwich panel
Implementation Method 2
a blowing agent; and optionally (v) at least one chain extender or crosslinking agent
Implementation Method 3
a catalyst, (iv) a blowing agent
Implementation Method 4
which exhibit high temperature stability, allowing their use in automotive structural parts
Data Source
AI summary
The present disclosure provides a reaction mixture for producing polyurethane/polyisocyanurate sandwich panels having a high temperature stability of up to about 230 Deg C. The polyurethane/polyisocyanurate sandwich panels may be used in connection with the production of automotive structural parts. The present disclosure also provides a process for the production of a polyurethane/polyisocyanurate molded article which exhibits high temperature stability.