Phosphonium Dicarboxylic Acid Ionic Liquid for Polyamide Flame Retardancy
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Solution Overview
Problem
Current flame retardant solutions for polyamide 6,6 fibers lack durability and stability, especially in high-temperature environments, and often require halogenated materials that are not compatible with the polymer, leading to leaching issues and reduced performance in stringent applications like space and military standards.
Innovation Solution
Incorporation of phosphonium salt-containing dicarboxylic acid groups into the polymeric backbone as a flame retardant additive, which can directly bond with the polymer chain, providing intrinsic flame retardancy and stability through the use of tributyl phosphonium salts and dicarboxylate anions, allowing for halogen-free and durable flame retardant textiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If halogenated flame retardant materials are used to achieve flame retardancy, then flame retardant performance is improved, but compatibility with polyamide polymer and stability at high temperature deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters by using phosphonium salts with specific structures (Formula 1) containing dicarboxylic acid groups instead of halogenated materials. This parameter change maintains flame retardancy while improving thermal stability and compatibility with polyamide polymers at high temperatures
Solution Approach 2:
The invention creates a composite flame retardant system by combining phosphonium cations with dicarboxylic acid anions to form phosphonium dicarboxylate salts. This composite structure provides both flame retardant properties and enhanced stability through the synergistic interaction between the cation and anion components
2Ease of manufacture
If surface coating methods are used to apply flame retardant treatment, then ease of application is improved, but durability after washing deteriorates
Solution Approach 1:
The invention merges the flame retardant function with the polymer matrix by incorporating phosphonium dicarboxylate salts into the polyamide structure. This integration ensures the flame retardant properties are permanently bound to the fiber, maintaining durability through multiple washing cycles
Solution Approach 2:
The dicarboxylic acid groups act as intermediaries that form strong bonds between the phosphonium flame retardant and the polyamide polymer chain. This intermediary connection ensures durable attachment of the flame retardant to the fiber, preventing leaching during washing
3Ease of manufacture
If low molecular weight flame retardant additives are used, then ease of incorporation is improved, but leaching over time deteriorates
Solution Approach 1:
The invention uses composite phosphonium dicarboxylate salt structures where the ionic bonding between phosphonium cations and dicarboxylate anions creates a stable complex that resists leaching while remaining incorporable into the polymer matrix
Solution Approach 2:
The dicarboxylic acid groups serve as intermediaries that anchor the phosphonium flame retardant to the polyamide chain through strong bonding, preventing leaching while allowing easy incorporation during fiber production
4Reliability
If high molecular weight flame retardant additives are used to prevent leaching, then stability is improved, but compatibility and miscibility with polyamide resin deteriorate
Solution Approach 1:
The invention optimizes the molecular weight and structural parameters of the phosphonium dicarboxylate salts to achieve a balance between stability and compatibility. The specific structure (Formula 1) with controlled chain length and ionic groups ensures both stability and miscibility with polyamide resins
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 solution achieves enhanced thermal stability and improved flame retardancy, meeting stringent standards with a halogen-free composition that maintains performance even after multiple wash cycles and high-temperature exposure, as demonstrated by increased limiting oxygen index and successful UL-94 V0 grade fire testing.
Implementation Method 1
Incorporation of phosphonium salt-containing dicarboxylic acid groups into the polymeric backbone as a flame retardant additive, which can directly bond with the polymer chain
Data Source
AI summary
A phosphorus-containing ionic liquid, a phosphorus-containing a flame retardant additive, and a preparation method thereof are provided. Also provided are co-monomer salt compositions for flame retardant polymers. Also provided are polymers that comprise the phosphorus-containing flame retardant ionic liquid or flame retardant co-monomer salt. The resin composition may be used to make various articles, including fibers, fabrics, and yarns.