Boronated Polyphosphinohydrazide Fire Retardant Char Formation
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Solution Overview
Problem
Current fire retardants, such as brominated compounds, are ineffective above 2000° F and generate toxic byproducts, while existing phosphorylated compounds do not form a structurally stable char, necessitating a fire retardant that maintains effectiveness up to higher temperatures without toxicity and leaching.
Innovation Solution
Boronated polyphosphinohydrazides with a specific structural unit are chemically bound to resins, forming a stable char with enhanced thermal stability up to 3000° F and preventing leaching, achieved by reacting phosphinohydrazide polymers with boric acid and incorporating them into polymer structures like polyimides and epoxies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brominated fire retardants are used, then fire retarding capability is improved, but toxic byproducts are generated and effectiveness is lost above 2000° F
Solution Approach 1:
The patent changes the chemical composition parameters by replacing brominated compounds with phosphorylated compounds containing specific functional groups (carboxyl, hydroxyl, amino, or halogen substituents). This chemical parameter change eliminates toxic byproduct generation while maintaining fire retarding effectiveness at temperatures up to 2000° F and above
Solution Approach 2:
The patent employs phosphorylated compounds that decompose to form protective char layers rather than generating persistent toxic emissions. The fire retardant mechanism transitions from long-lasting brominated compounds to a system that creates a temporary but effective protective barrier during fire exposure
2Object-affected harmful factors
If phosphorylated compounds are used to replace brominated fire retardants, then toxic byproduct generation is reduced, but fire retarding capability above 2000° F is insufficient
Solution Approach 1:
The patent introduces specific local chemical features into the phosphorylated compounds by adding carboxyl, hydroxyl, amino, or halogen substituents at specific positions. These localized functional groups enhance the overall thermal stability and fire retarding effectiveness at high temperatures while maintaining the low toxicity benefit
Solution Approach 2:
The patent creates a composite chemical structure by combining phosphorylated compounds with specific functional substituents (carboxyl, hydroxyl, amino, or halogen groups). This composite molecular structure achieves synergistic effects that provide both low toxicity and enhanced high-temperature fire resistance
3Reliability
If fire retardants are added to polymer structures, then flammability is reduced, but leaching occurs over time
Solution Approach 1:
The patent extracts the fire retarding function from separate additive compounds and integrates it directly into the polymer backbone structure. The phosphorylated compounds with specific functional groups become integral parts of the polymer chain, eliminating leaching while maintaining fire protection
Solution Approach 2:
The patent merges the fire retarding functionality with the polymer structure itself by incorporating phosphorylated compounds containing carboxyl, hydroxyl, amino, or halogen substituents into the polymer backbone. This combination ensures the fire retardant properties are permanently embedded in the material rather than being separate additives
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 boronated polyphosphinohydrazides significantly increase fire retarding capability by 500° F to 1000° F above 2000° F, create a high thermal barrier, and form stable, non-volatile chars with minimal smoke evolution, maintaining structural integrity under extreme heat.
Implementation Method 1
the boronated polyphosphinohydrazide can be chemically bound to a large variety of resins, adhesives, or coatings... forming a stable char with enhanced thermal stability up to 3000° F
Data Source
AI summary
Boronated polyphosphinohydrazide fire retardants are provided having the basic structural unit:wherein,Y is O or S;R can be selected from H, alkyl (e.g., linear, branched, saturated, or unsaturated), aryl, heterocyclic, cycloaliphatic (e.g., saturated or unsaturated), or a metallocene (e.g., ferrocene, zirconocene or the like); andn can be selected from 1 to 500.