Modified Polymer Polyol Dispersion Reducing Formaldehyde Emission
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Solution Overview
Problem
Polyurethane foams prepared from existing modified polymer polyols exhibit high formaldehyde release, exceeding safety limits, which poses health risks and requires a method to reduce formaldehyde emission while maintaining stability and flame retardant properties.
Innovation Solution
A stable modified polymer polyol dispersion is created using a liquid polyol mixture with a monofunctional polyetheramine and phosphorus-containing compounds, such as bis(hydroxymethyl)phosphanyl]methanol and its derivatives, to produce polyurethane materials with reduced formaldehyde content and improved stability, achieved through a process involving distillation to remove volatile compounds and optimize reaction conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If modified polymer polyols are used to prepare polyurethane foams, then flame retardant properties are improved, but formaldehyde release increases above safety limits
Solution Approach 1:
The patent changes the chemical parameters of the polyol system by incorporating specific phosphorus-containing compounds (bis(hydroxymethyl)phosphanyl]methanol and its derivatives) at controlled concentrations (0.1-10 wt%, preferably 0.5-5 wt%). This parameter change allows achieving flame retardancy while controlling formaldehyde release through optimized chemical composition rather than relying on traditional formaldehyde-heavy modifiers
Solution Approach 2:
The invention creates a composite polyol system combining base polyol with dispersed polymeric particles containing phosphorus and nitrogen compounds. This composite structure (dispersion of particles in liquid polyol mixture) provides flame retardant properties through the phosphorus-nitrogen synergistic effect while the dispersed particle format controls formaldehyde release, achieving both safety requirements simultaneously
2Object-generated harmful factors
If phosphorus-containing compounds are added to reduce formaldehyde release, then formaldehyde emission decreases, but dispersion stability may be affected
Solution Approach 1:
The patent uses monofunctional polyetheramine as an intermediary substance that mediates between the phosphorus-containing polymeric particles and the base polyol. This intermediary improves wetting and dispersion of particles, ensuring stable dispersion while allowing the phosphorus compounds to effectively reduce formaldehyde release without compromising composition stability
Solution Approach 2:
The invention optimizes multiple parameters simultaneously: phosphorus compound concentration (0.1-10 wt%), particle size distribution, and polyetheramine content, to achieve the optimal balance between formaldehyde reduction effectiveness and dispersion stability. This multi-parameter optimization ensures both requirements are met
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 method effectively reduces formaldehyde release in polyurethane foams to below 10 μg/m3, maintaining stability and flame retardant properties, thus addressing health and safety concerns while meeting environmental standards.
Implementation Method 1
preparation of the polymeric particles in the presence of the at least one base polyol by a polycondensation reaction of a) at least one compound bearing at least one basic-nitrogen atom with b) at least one compound bearing a phosphorus atom
Implementation Method 2
achieved through a process involving distillation to remove volatile compounds
Data Source
AI summary
The present invention relates to new stable modified polymer polyol dispersions. The modified polymer polyols of the present invention comprise at least one polyol and a stable dispersion of polymeric particles in the at least one polyol. There are also disclosed processes for the preparation of the herein described modified polymer polyols, and processes for preparing polyurethane materials containing them.