Phosphorus Polymer Textile Treatment for Flame-Resistant Fabrics
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Solution Overview
Problem
Current flame-resistant fabrics, particularly cellulosic or cellulosic-blend fabrics, often fail to meet demanding flammability standards, necessitating the use of expensive inherent flame-resistant fibers, and there is a need for alternative flame retardant compounds to enhance fabric flame resistance.
Innovation Solution
A textile material treated with a phosphorus-containing polymer, where the polymer is applied in the form of microprotuberances on the fiber surface, produced through a process involving a phosphonium compound and a nitrogen-containing cross-linking compound in a condensation reaction, followed by oxidation to convert phosphorus atoms to a pentavalent state, resulting in a flame-retardant polymer with a low content of hydroxyalkyl groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellulosic or cellulosic-blend fabrics are treated with conventional flame retardant compounds, then the fabrics remain comfortable and cost-effective, but the flammability performance is insufficient to meet demanding industry requirements
Solution Approach 1:
The patent changes the chemical parameters of the flame retardant treatment by using phosphonium compounds with specific structures (Formula I) and controlling the oxidation state of phosphorus atoms. The treatment composition parameters (pH, temperature, concentration) are optimized to achieve superior flame resistance while maintaining fabric comfort and meeting stringent flammability standards
Solution Approach 2:
The invention creates a composite treatment system combining phosphonium compounds, nitrogen-containing cross-linking compounds, and oxidizing agents. This composite approach produces a flame retardant polymer coating that integrates multiple functional components to achieve enhanced flammability performance beyond what single compounds can provide
2Reliability
If inherent flame resistant fibers (e.g., meta-aramid fibers) are employed to meet flammability requirements, then the flame resistance is sufficient, but the cost of the fabrics increases significantly
Solution Approach 1:
The patent replaces expensive inherent flame resistant fibers with a cost-effective chemical treatment applied to conventional cellulosic fibers. The flame retardant properties are achieved through the applied polymer coating rather than through expensive specialized fibers, significantly reducing fabric cost while maintaining adequate flame resistance
Solution Approach 2:
The invention changes the chemical composition and structure of the flame retardant polymer through controlled oxidation of phosphorus atoms to pentavalent state and limitation of hydroxyalkyl groups. These parameter changes optimize the flame retardant efficiency, allowing conventional fibers to achieve performance levels previously only available from expensive inherent flame resistant fibers
3Ease of operation
If conventional flame retardant treatments are applied to cellulosic fabrics, then the fabrics remain comfortable to wear, but the flammability performance does not meet demanding industry standards
Solution Approach 1:
The patent optimizes multiple parameters of the flame retardant treatment including phosphorus compound structure, oxidation level, polymer molecular weight, and treatment composition pH. These parameter optimizations achieve superior flame resistance while maintaining fabric hand, drape, and comfort properties essential for wearable garments
Solution Approach 2:
The invention creates localized flame retardant protection through the formation of microprotuberances on fiber surfaces and differential polymer distribution. This local quality approach ensures flame retardant efficacy at the fiber level while maintaining overall fabric comfort and flexibility
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 treated textile material exhibits improved flame resistance, meeting stringent standards and providing effective protection against flames and electrical arc flashes, while maintaining comfort and durability.
Implementation Method 1
reacting the phosphorus-containing compound and the nitrogen-containing cross-linking compound in a condensation reaction to produce a first intermediate polymer
Implementation Method 2
oxidizing the first intermediate polymer to convert at least a portion of the phosphorus atoms in the first intermediate polymer to a pentavalent, phosphine oxide state
Implementation Method 3
at least a portion of the flame retardant, phosphorus-containing polymer is present in the form of a plurality of microprotuberances protruding from the surface of the textile fibers
Data Source
AI summary
An article comprises a textile material and a flame retardant, phosphorus-containing polymer. The flame retardant, phosphorus, containing polymer can be present in the form of a plurality of microprotuberances. The flame retardant, phosphorus, containing polymer can contain a relatively low amount of residual hydroxyalkyl groups bonded to the phosphorus atoms in the polymer. A process for producing a treated textile material is also provided.