Polyurethane Foam Water Stopping via PPG Polyol
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Solution Overview
Problem
Conventional polyurethane foams used for water stopping applications are expensive and do not meet the higher water stopping requirements due to the use of special raw materials and insufficient water stopping properties.
Innovation Solution
A polyurethane foam composition containing a polyoxypropylene glyceryl ether-based polyol, tolylene diisocyanate-based isocyanate, a low molecular weight polyol cross-linking agent, and a catalyst blend, specifically optimized in terms of molecular weight, content ratios, and types, to achieve high water stopping properties using general-purpose raw materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If special raw materials (dimer acid polyol) are used to achieve high water stopping properties, then water stopping performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the molecular weight parameter of the polyol from conventional values to specifically 3400-4400, and adjusts the isocyanate index to 105-115, which transforms the chemical structure and properties of the polyurethane foam to achieve high water stopping performance using general-purpose raw materials instead of expensive special materials
Solution Approach 2:
The patent replaces expensive special raw materials (dimer acid polyol) with cheap general-purpose raw materials (PPG-based polyol with molecular weight 3400-4400), achieving the same or better water stopping performance through parameter optimization rather than through expensive material substitution
2Ease of manufacture
If general-purpose raw materials are used to reduce cost, then manufacturing cost decreases, but water stopping properties become insufficient
Solution Approach 1:
The patent creates a composite chemical system combining PPG-based polyol (molecular weight 3400-4400), TDI-based isocyanate, and a specific cross-linking agent in precise proportions, where the synergistic interaction of these components produces a polyurethane foam with exceptional water stopping properties that exceeds what any single component could achieve alone
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: polyol molecular weight (3400-4400), isocyanate index (105-115), and cross-linking agent content (3-7 parts by mass per 100 parts polyol), where the combined effect of these parameter changes transforms general-purpose raw materials into a high-performance water stopping system
3Reliability
If polyol molecular weight is increased to improve water stopping properties, then water stopping performance is enhanced, but foaming uniformity may be affected
Solution Approach 1:
The patent identifies and optimizes the polyol molecular weight parameter to a specific range of 3400-4400, which is the critical threshold that simultaneously achieves high water stopping performance and maintains proper foaming uniformity, balancing two competing requirements through precise parameter control
Solution Approach 2:
The patent uses the water stopping performance test (measuring water penetration resistance) as a feedback criterion to validate and optimize the polyol molecular weight selection, ensuring that the chosen parameter range actually delivers the desired performance improvement while maintaining foaming uniformity
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 solution enables the production of polyurethane foams with enhanced water stopping properties at a reduced cost, suitable for various applications including automobiles, housing, and consumer electronics, while maintaining mechanical strength and uniform foaming.
Implementation Method 1
a polyurethane foam obtained by foaming and curing a composition containing a polyol component, an isocyanate component, a foam stabilizer, a cross-linking agent and a catalyst
Data Source
AI summary
Using general purpose raw materials, a polyurethane foam having higher water stopping properties than conventional ones is provided. The polyurethane foam is a polyurethane foam obtained by foaming and curing a composition containing a polyol component, an isocyanate component, a foam stabilizer, a cross-linking agent, and a catalyst.