Phosphine Oxide Flame-Retardant Polymer for Wash-Durable Textiles
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Solution Overview
Problem
Flame retardant, phosphorus-containing polymers used on cellulose-containing fabrics tend to release formaldehyde, which is problematic and existing solutions fail to provide a long-term solution, as their efficacy is lost after a few washes.
Innovation Solution
A phosphorus-containing polymer with 75% or more of its phosphorus atoms in phosphine oxide moieties, produced through a process involving a phosphonium compound, a nitrogen-containing cross-linking compound, and exposure to a Brønsted base and oxidizing agent, resulting in a polymer with enhanced durability and reduced formaldehyde release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phosphorus-containing polymers are used to provide flame resistance, then flame retardant performance is achieved, but formaldehyde release occurs over time reducing durability
Solution Approach 1:
The invention changes the chemical structure parameter by requiring at least 75% of phosphorus atoms to be in phosphine oxide moieties rather than other phosphorus forms. This structural parameter change eliminates the formaldehyde release mechanism while preserving flame retardant performance, resolving the contradiction between durability and harmful emissions
Solution Approach 2:
The invention converts the potentially harmful phosphonium moieties into beneficial phosphine oxide moieties through oxidation. This transformation eliminates the harmful formaldehyde release while maintaining or enhancing the flame retardant properties, turning a harmful chemical form into a beneficial one
2Duration of action of stationary object
If existing flame retardant solutions are applied to fabric, then initial flame resistance is provided, but efficacy is lost after a couple of washes
Solution Approach 1:
The invention performs preliminary oxidation to convert phosphonium moieties to phosphine oxide moieties before the polymer is applied to the fabric. This preliminary chemical transformation ensures that the polymer starts in a stable, non-formaldehyde-releasing state, preventing the loss of efficacy that occurs with conventional polymers after washing
Solution Approach 2:
The invention extracts or removes the problematic phosphonium moieties from the final polymer structure by converting them to phosphine oxide moieties. This extraction of the harmful component eliminates the source of formaldehyde release and durability problems while retaining the essential flame retardant functionality
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 polymer exhibits improved durability and thermal protective performance, with significantly reduced formaldehyde content, maintaining effectiveness even after multiple washes and providing better long-term flame resistance.
Implementation Method 1
exposing the first intermediate polymer to a Brønsted base under conditions sufficient to convert at least a portion of the phosphonium moieties to phosphine moieties
Implementation Method 2
oxidizing the second intermediate polymer by exposing the second intermediate polymer to a suitable oxidizing agent under conditions sufficient to oxidize at least a portion of the phosphorus atoms in the polymer to a pentavalent state
Data Source
AI summary
A phosphorus-containing polymer comprises a plurality of phosphorus atoms, wherein about 75% or more of the phosphorus atoms in the phosphorus-containing polymer are present in phosphine oxide moieties. An article comprises a textile material having at least one surface and a phosphorus-containing polymer disposed on a least a portion of the surface, wherein the phosphorus-containing polymer comprises a plurality of phosphorus atoms, and wherein about 75% or more of the phosphorus atoms in the phosphorus-containing polymer are present in phosphine oxide moieties.