Phosphonate Polyester Fibers With Flame Resistance and Melt Processability
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Solution Overview
Problem
Imparting fire resistance to polyester fibers without compromising their melt processability, mechanical properties, and environmental safety, as existing flame retardants often increase melt viscosity, are toxic, and leach into the environment.
Innovation Solution
Incorporating phosphorous-containing polymers or oligomers, such as polyphosphonates, copoly(phosphonate esters), and copoly(phosphonate carbonates), into thermoplastic polyesters to create fibers that maintain acceptable melt processing characteristics and meet fire resistance standards while avoiding environmental concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flame retardants are added to polyester fibers, then fire resistance is improved, but melt viscosity increases and processability deteriorates
Solution Approach 1:
The patent changes the chemical structure parameters of flame retardant molecules, transitioning from traditional brominated or phosphorus-based compounds to phosphonate esters with specific molecular weights and functional groups. This parameter change allows the flame retardant to integrate into the polyester matrix without significantly increasing melt viscosity, thus maintaining processability while achieving fire resistance
Solution Approach 2:
The patent creates a composite material system where phosphonate ester flame retardants are combined with polyester fibers through compatibilizers. This composite approach allows the flame retardant to be effectively incorporated into the polyester matrix without compromising the base polymer's processability and mechanical properties
2Reliability
If conventional flame retardants are used, then fire resistance is achieved, but mechanical properties and dyeing characteristics deteriorate
Solution Approach 1:
The patent modifies the molecular parameters of flame retardants to match the polyester matrix characteristics. By selecting phosphonate esters with appropriate molecular weights, functional groups, and structural features, the flame retardant integrates seamlessly into the polyester matrix without creating stress concentration points or disrupting the polymer chain structure, thereby preserving mechanical strength and modulus
3Reliability
If traditional flame retardants are applied, then fire resistance is improved, but environmental safety deteriorates due to toxicity and leaching
Solution Approach 1:
The patent converts the harmful environmental properties of traditional flame retardants into beneficial characteristics by replacing toxic brominated compounds and persistent phosphorus-based additives with biodegradable phosphonate esters. These new flame retardants maintain fire resistance functionality while being environmentally benign, non-toxic, and capable of breaking down into harmless substances, thus eliminating the harmful effects associated with conventional flame retardants
4Reliability
If flame retardants are added to polyester, then fire resistance is improved, but heat-setting and dyeing characteristics deteriorate
Solution Approach 1:
The patent adjusts the thermal parameters of the flame retardant system by selecting phosphonate esters with decomposition temperatures and thermal stability characteristics that are compatible with polyester heat-setting processes. The flame retardant remains stable during heat-setting temperatures, allowing the polyester to undergo normal heat-setting operations without interference, while still providing fire resistance
Data Source
AI summary
The invention relates to the use of polyphosphonates, copoly(phosphonate ester)s, copoly(phosphonate carbonate)s, and their respective oligomers, as flame retardant additives for polyester fibers to impart fire resistance while maintaining or improving processing characteristics for melt spinning fibers.