Bridged Phosphorus Flame Retardants for Polymers
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Solution Overview
Problem
Current flame retardants for polypropylene and polyurethane materials are ineffective due to high flammability and toxicity, limiting their applications, and existing bridged phosphorus compounds are not suitable for industrial upscaling.
Innovation Solution
Development of novel bridged phosphorus compounds with alkyl sulfone or alkyl phosphine oxide bridges, which are synthesized using specific reaction methods and incorporated into polymeric materials to enhance flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flame retardants are used for polypropylene and polyurethane, then flame retardancy is improved, but toxicity increases and flame retardant effectiveness decreases due to high flammability
Solution Approach 1:
The invention uses composite flame retardant systems combining phosphorus-containing compounds with sulfur-based additives, creating synergistic effects that improve flame retardancy while reducing toxicity. The patent specifically mentions systems comprising phosphorus, sulfur, nitrogen, and metal hydroxides that work together to enhance fire resistance beyond what single components can achieve.
Solution Approach 2:
The invention modifies the chemical structure of phosphorus compounds by introducing bridging groups (sulfone, carboxylate, phosphate, phosphonate) to create new compounds with improved thermal stability and flame retardant performance. This structural parameter change allows the material to maintain effectiveness at higher temperatures while reducing toxic emissions.
2Reliability
If phosphorus content in flame retardant molecules is increased, then fire resistance is improved, but the amount of additive needed increases
Solution Approach 1:
The invention merges multiple functional groups (phosphorus, sulfur, nitrogen, metal hydroxides) into integrated flame retardant systems where each component contributes to fire resistance. This synergistic combination allows achieving the same or better fire protection with reduced total additive loading compared to conventional single-component systems.
Solution Approach 2:
By creating composite flame retardant molecules with bridging structures that incorporate multiple elements, the invention achieves higher fire resistance per unit mass. The synergistic interactions between different components in the composite structure enhance the efficiency of phosphorus utilization, reducing the overall quantity of additive required.
3Reliability
If existing bridged phosphorus compounds are used, then flame retardant performance is achieved, but industrial upscaling is not suitable
Solution Approach 1:
The invention segments the synthesis process into manageable steps that can be scaled industrially. The bridged phosphorus compounds are synthesized through controlled reactions of phosphorus-containing compounds with sulfur-based or metal-based bridging agents, allowing for modular production and easier industrial upscaling compared to existing methods.
Solution Approach 2:
The invention optimizes synthesis parameters (temperature, pressure, catalysts, reaction time) to enable industrial-scale production. By adjusting these parameters, the synthesis process becomes more efficient, safer, and more suitable for large-scale manufacturing while maintaining the high flame retardant performance of the compounds.
Data Source
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AI summary
The invention relates to novel bridged phosphorus compounds comprising an alkyl sulfone bridge or an alkyl phosphine oxide bridge with the general formula (I) wherein n is 2 or 3, and wherein and wherein [P(O)]-H is selected from various phosphorus containing compounds. Such bridged compounds are useful as flame retardant substances, particularly as an admixture into polymeric materials.