Reactive Phospholene-1-Oxides for Non-Leaching Polyurethane Flame Retardancy
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Solution Overview
Problem
There is a need for sustainable, reactive, and halogen-free flame retardants that are effectively integrated into polyurethane systems to address fire safety concerns in synthetic materials like polyurethane foams without posing health hazards by leaching into the environment.
Innovation Solution
Development of novel hydroxyl-functional phospholene-1-oxides with high phosphorus content, which are fully reactive and compatible with polyol components, becoming integral to the polymer substrate, thus preventing environmental release and health hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional brominated or phosphorus-based flame retardants are used, then fire retardancy is improved, but environmental safety deteriorates due to leaching and health hazards
Solution Approach 1:
The patent combines the flame retardant phosphorus compound with the polyol component through chemical bonding, merging two previously separate functions (flame retardancy and polyol component) into a single integrated molecule. This eliminates leaching while maintaining fire protection.
Solution Approach 2:
The flame retardant functionality is built into the polyol structure during the polyurethane synthesis process, performing the protective function before the product is even put to use. The reactive phosphorus-containing compound is incorporated into the polymer matrix during foam formation, ensuring permanent integration.
2Object-affected harmful factors
If reactive flame retardants are used to prevent leaching, then environmental safety is improved, but compatibility with polyol components must be maintained
Solution Approach 1:
The patent introduces specific functional groups (hydroxyl groups) at localized positions on the phosphorus-containing molecule, enabling selective chemical reactivity with isocyanates while maintaining the overall molecular structure's compatibility with polyol systems. The local hydroxyl functionality provides the reactive bonding capability without compromising overall system compatibility.
Solution Approach 2:
The patent modifies the chemical parameters of the flame retardant by introducing hydroxyl-functional groups, changing its reactivity profile to match that of polyol components. This parameter change (adding -OH groups) enables the flame retardant to participate in polyurethane chemistry as if it were a native polyol component.
3Reliability
If high phosphorus content compounds are used for effective flame retardancy, then fire protection is improved, but reactivity and integration into polymer matrix become more difficult
Solution Approach 1:
The patent divides the phosphorus-containing molecule into distinct functional segments: a phosphorus core providing flame retardancy and hydroxyl groups providing reactivity. This segmentation allows each part to perform its specific function independently, with the hydroxyl groups handling polymerization and the phosphorus core providing fire protection.
Solution Approach 2:
The patent creates a composite molecular structure combining phosphorus-containing flame retardant functionality with hydroxyl-functional polyol characteristics. This molecular-level composite material integrates multiple functions (flame retardancy, reactivity, polyol compatibility) into a single compound that exhibits properties of both constituent functional groups.
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
These compounds provide excellent fire retardancy while ensuring environmental safety and compatibility with polyurethane systems, effectively addressing the demand for sustainable and reactive flame retardants.
Implementation Method 1
The novel phosphorus-containing hydroxyl-functional compounds are fully reactive through their hydroxyl-functional group. This means that the flame retardants of the invention become integrated into the polymer substrate
Implementation Method 2
Brominated or phosphorus-based flame retardants are known to be highly effective and in many cases are the only options for reducing the fire risk of synthetic materials such as rigid or flexible polyurethane foams
Data Source
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AI summary
The present invention provides novel cyclic phosphorus-containing compounds, namely hydroxyl-functional phospholene-1-oxides, serving as highly efficient reactive flame retardants in urethane systems, particularly in flexible polyurethane foams, semi-rigid and rigid polyurethane and polyisocyanurate foams. The invention further provides fire-retarded polyurethane compositions comprising said hydroxyl-functional phospholene-1-oxides.