Flexible PU Foam Composition for Shape Recovery After Compression
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Solution Overview
Problem
Shaped flexible polyurethane foam articles, such as mattresses, face challenges in recovering their original dimensions after compression due to material fatigue caused by the high forces required for storage and transport, leading to incomplete re-expansion.
Innovation Solution
Incorporating a specific compound of formula (R12R2SiO1/2)a[R13SiO1/2]b[R12SiO2/2]c[R1R2SiO2/2]d[R3SiO3/2]e[SiO4/2]fGg, where a, b, c, d, e, and f represent various siloxane units, which acts as a foam stabilizer, into the production of hot-cure flexible PU foam to enhance dimension recovery after compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If shaped flexible PU foam articles are compressed for storage and transport, then space is saved, but material fatigue occurs and dimension recovery capability deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the foam by incorporating specific siloxane compounds (formula 1) with controlled ratios of different siloxane units. This changes the molecular structure and physical properties of the foam, enabling it to maintain dimensional recovery capability even after prolonged compression. The parameter change in composition directly addresses the contradiction by making the foam more resilient to compression-induced fatigue.
Solution Approach 2:
The patent creates a composite foam material by combining polyol, isocyanate, blowing agent, catalyst, and specifically engineered siloxane compounds. This composite structure integrates the benefits of different components: the siloxane units provide flexibility and recovery, while the polyurethane matrix provides structural integrity. The composite nature of the material allows it to withstand compression and recover dimensions effectively.
2Productivity
If high compression force is applied to flatten mattresses for rolling, then transport efficiency improves, but the force causes material fatigue and reduces shape recovery
Solution Approach 1:
The patent incorporates siloxane compounds beforehand into the foam structure to provide inherent cushioning and protection against compression damage. These siloxane units act as a protective network within the foam matrix, absorbing and distributing compression forces before they can cause significant damage to the polyurethane structure. This beforehand cushioning enables the foam to withstand high compression forces during transport while maintaining strength and recovery capability.
3Volume of stationary object
If extended compression is applied for vacuum packaging, then space utilization improves, but the foam's ability to recover original shape deteriorates
Solution Approach 1:
The siloxane compounds in the foam maintain continuous elastic action even during extended compression periods. The molecular structure of the siloxane units allows for continuous reversible deformation, enabling the foam to maintain its recovery capability throughout prolonged vacuum packaging. This continuity of useful action ensures that the foam can recover its original shape after extended compression without permanent deformation.
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 use of this compound enables hot-cure flexible PU foam to recover its original shape effectively after extended compression, meeting low emissions standards and maintaining shape recovery over at least 20 hours, while also reducing volatile organic compound emissions.
Implementation Method 1
the foam stabilizer comprises at least one compound of formula (1)... enables hot-cure flexible PU foam to recover its original shape effectively after extended compression
Data Source
AI summary
A shaped flexible hot-cure PU foam article, preferably mattress and/or cushion, may be obtained by reaction of at least one polyol component and at least one isocyanate component in the presence of at least one blowing agent and one or more catalysts that catalyze the isocyanate-polyol and/or isocyanate-water reactions and/or isocyanate trimerization, foam stabilizer, and further additives. The foam stabilizer may include at least one compound of formula (1)[R12R2SiO1/2]a[R13SiO1/2]b[R12SiO2/2]c[R1R2SiO2/2]d[R3SiO3/2]e[SiO4/2]fGg (1).