Rigid Isocyanurate Foam Composition for Dual Energy and Sound Absorption
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Solution Overview
Problem
Existing rigid isocyanurate foam technologies face challenges in achieving both excellent energy absorption and sound absorption performance, with a trade-off relationship between the two, and lack sufficient stability and moldability.
Innovation Solution
A specific polyol composition comprising a trifunctional or higher-functional polyether polyol with a hydroxy value of 300 mg KOH/g or more, a polyether polyol with 50% ethylene oxide content, and another polyether polyol with 10% or less ethylene oxide content, combined with a polyisocyanate, to create a starting material composition with an isocyanate index of 105 to 400, enhancing both energy and sound absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If rigid isocyanurate foam is designed to improve energy absorption performance, then sound absorption performance deteriorates, and vice versa
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of polyol components (specific polyether polyols with defined ethylene oxide contents and hydroxy values) and polyisocyanate to achieve optimal balance between energy absorption and sound absorption properties in the foam structure
Solution Approach 2:
The patent uses composite materials by combining multiple specific polyol components (polyether polyol A with 50% ethylene oxide content, polyether polyol B with 10% or less ethylene oxide content, and trifunctional or higher-functional polyether polyol C) with polyisocyanate to create a foam with superior dual performance
2Object-affected harmful factors
If foam density is increased to improve sound absorption, then energy absorption performance deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the chemical composition parameters of the foam precursors, specifically using polyether polyol A (50% ethylene oxide content), polyether polyol B (10% or less ethylene oxide content), and trifunctional or higher-functional polyether polyol C in defined ratios, which enables achieving both low density for sound absorption and appropriate mechanical properties for energy absorption
3Strength
If foam cell structure is stabilized to improve mechanical strength, then air permeability deteriorates
Solution Approach 1:
The patent applies composite materials by using a combination of specific polyol components with different functionalities and ethylene oxide contents, which creates a foam structure that maintains cell stability for mechanical strength while preserving air permeability through controlled cellular morphology
Solution Approach 2:
The patent applies local quality by having different polyol components contribute different local characteristics to the foam structure, where polyether polyol A provides baseline foam structure, polyether polyol B modifies cell stability, and trifunctional or higher-functional polyether polyol C creates crosslinked structures for mechanical strength while maintaining overall air permeability
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 produces rigid isocyanurate foam with improved energy absorption, sound absorption, moldability, and air permeability, addressing the trade-off issues in existing technologies.
Implementation Method 1
Rigid isocyanurate foam is a type of resin foam obtained by the reaction of a polyol and a polyisocyanate
Implementation Method 2
the reaction of a polyol and a polyisocyanate
Implementation Method 3
sound absorption performance
Implementation Method 4
air permeability
Implementation Method 5
energy absorption performance
Implementation Method 6
compressive stress of 300 to 700 N at 10 to 60%
Data Source
AI summary
Provided is a starting material composition suitable for producing rigid isocyanurate foam excellent in both energy absorption performance and sound absorption performance, while exhibiting excellent foam moldability, appearance, and air permeability. The starting material composition for rigid isocyanurate foam according to the present disclosure contains a polyol composition and a polyisocyanate. The polyol composition contains a trifunctional or higher-functional polyether polyol (C) having a hydroxy value of 300 mg KOH/g or more, a polyether polyol (A) different from polyether polyol (C) having an ethylene oxide content, based on the total amount of alkylene oxide of polyether polyol (A), of 50 mass % or more, and a polyether polyol (B) different from polyether polyol (C) having an ethylene oxide content, based on the total amount of alkylene oxide of polyether polyol (B), of 10 mass % or less.