Low-Density Polyurethane Foam for Sound Absorption and Odor Reduction
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Solution Overview
Problem
Existing polyurethane foams for sound-absorbing materials face challenges in achieving low density, satisfactory die formability, and enhanced sound absorption performance while minimizing odor and avoiding the use of fillers that can cause defects.
Innovation Solution
A polyurethane foam composition is developed, comprising a polyol mixture with specific additives such as catalysts, cell openers, chain extenders, and isocyanate, which are carefully formulated and processed to achieve low density, improved sound absorption, and reduced odor without using fillers like carbon nanotubes or calcium carbonate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the density of polyurethane foam is reduced by increasing foaming agent content, then weight is reduced, but moldability and appearance formability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the polyol mixture by introducing a specific polyol component with molecular weight of 1,000 to 3,000 and hydroxyl value of 50 to 150, which fundamentally alters the foam formation mechanism to achieve low density without sacrificing moldability
Solution Approach 2:
The patent creates a composite polyol mixture combining multiple polyols with different molecular weights and hydroxyl values, where the specific combination (including polyol with MW 1,000-3,000 and OH value 50-150) produces synergistic effects that enable both low density and good formability simultaneously
2Reliability
If fillers such as carbon nanotubes, calcium carbonate, graphite and magnesium hydroxide are added to improve sound absorption, then sound absorption performance is enhanced, but precipitate formation and layer separation occur
Solution Approach 1:
The patent removes (extracts) the harmful fillers (carbon nanotubes, calcium carbonate, graphite, magnesium hydroxide) from the composition while maintaining sound absorption performance through the inherent properties of the polyol mixture and foam structure
Solution Approach 2:
The patent converts the potential harm of using fillers by instead utilizing the polyol mixture composition itself as the beneficial element, where the specific polyol components provide sound absorption functionality without the drawbacks of traditional fillers
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 polyurethane foam exhibits low density, excellent die formability, and enhanced sound absorption performance, while also reducing odor and avoiding defects associated with filler use.
Implementation Method 1
a polyol mixture including a polyol, and at least one additive selected from the group consisting of a catalyst, a cell opener, a chain extender, a crosslinking agent, a foaming agent, a surfactant, a reducing agent and combinations thereof, and isocyanate
Implementation Method 2
the structure of cells constituting polyurethane foam used to increase sound absorption should be designed such that there are more open cells (continuous foam) than closed cells (individual foam)
Data Source
AI summary
Disclosed are a polyurethane foam composition for sound-absorbing materials, a method for manufacturing a polyurethane foam and a polyurethane foam manufactured using the method. Particularly, disclosed are a composition containing a polyol mixture including a polyol and an additive, and isocyanate, and the manufacture of a low-density polyurethane foam for sound-absorbing materials, which is imparted with improved appearance formability, reduced smell and enhanced sound absorption performance by controlling the content of the composition and the conditions for foaming the composition.