Phosphonate Oligomers for Epoxy Flame Retardancy
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Solution Overview
Problem
Conventional methods for rendering polymers flame retardant using additives like brominated compounds or aluminum and phosphorus can compromise processing characteristics and mechanical performance, and these additives are often toxic, leading to environmental concerns and phase-out in some countries.
Innovation Solution
Development of oligomeric phosphonates with a high percentage of non-reactive end-groups, such as phenyl or phenyl phosphonate ester end-groups, which can be incorporated into polymers like epoxies to provide flame resistance without detracting from mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flame retardant additives (brominated compounds, aluminum, phosphorus) are used to render polymers flame retardant, then flame resistance is improved, but processing characteristics and mechanical performance deteriorate
Solution Approach 1:
The patent combines the flame retardant function with the polymer matrix by incorporating phosphonate oligomers during the polymerization process. This merging approach integrates the flame retardant additive into the polymer structure itself, eliminating the need for separate additive incorporation steps and avoiding the processing issues associated with conventional additives.
Solution Approach 2:
The patent uses composite materials by creating a polymer matrix containing phosphonate oligomers with specific structural characteristics. The composite structure combines the base polymer with phosphonate-containing units that provide flame resistance while maintaining compatibility with the polymer matrix, thus preserving processing characteristics and mechanical performance.
2Reliability
If conventional flame retardant additives (brominated compounds, aluminum, phosphorus) are used to render polymers flame retardant, then flame resistance is improved, but mechanical performance deteriorates
Solution Approach 1:
The patent merges the flame retardant function with the polymer matrix by incorporating phosphonate oligomers during polymerization. This integration ensures that the flame retardant units become part of the polymer structure rather than separate phases, preserving the mechanical integrity and strength of the material.
Solution Approach 2:
The patent changes the structural parameters of the phosphonate units by controlling their oligomeric state and end-group functionality. By adjusting these parameters, the patent optimizes both flame resistance and mechanical performance, achieving a balance that conventional additives cannot provide.
3Reliability
If conventional flame retardant additives are used, then flame resistance is improved, but environmental harm increases due to toxicity
Solution Approach 1:
The patent changes the chemical composition parameters by using phosphonate units with specific structures and controlling their oligomeric state. This parameter optimization reduces toxicity while maintaining flame resistance, addressing environmental concerns associated with conventional brominated and heavy metal additives.
Solution Approach 2:
The patent applies local quality by ensuring that the phosphonate units are distributed uniformly throughout the polymer matrix at the molecular level. This uniform distribution ensures consistent flame resistance while using environmentally friendly phosphonate chemistry instead of toxic conventional additives.
4Reliability
If phosphonate oligomers with non-reactive end-groups are used, then flame resistance is maintained, but reactivity with epoxy resin is reduced
Solution Approach 1:
The patent applies local quality by creating phosphonate oligomers with heterogeneous end-group functionality. The majority of end-groups are non-reactive (e.g., phenyl) to maintain flame resistance, while a minority are reactive to enable curing with epoxy resin. This localized distribution of reactive and non-reactive groups optimizes both flame resistance and adaptability.
Solution Approach 2:
The patent changes the compositional parameters of the phosphonate oligomers by controlling the ratio of reactive to non-reactive end-groups. By optimizing this parameter, the patent achieves sufficient reactivity for epoxy curing while maintaining the flame resistance properties provided by the non-reactive phosphonate units.
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 oligomeric phosphonates effectively impart excellent flame retardancy while maintaining the mechanical properties of the base polymer, as demonstrated by achieving a limiting oxygen index of at least 27 and meeting UL-94 V0 ratings, indicating self-extinguishing capabilities without producing noticeable smoke.
Implementation Method 1
Curing of epoxy resins with phosphonate oligomers
Data Source
AI summary
Embodiments described herein are directed to oligomeric phosphonates and polyphosphonates that have non-reactive end groups, methods for making such oligomeric phosphonates and polyphosphonates, and compositions containing such oligomeric phosphonates and polyphosphonates. The oligomeric phosphonates and polyphosphonates of such embodiments may be incorporated into engineering polymeric into which they are mixed to make polymer compositions having good flame retardancy and mechanical properties.