Phosphorus Flame Retardant Solubility and Thermal Stability
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Solution Overview
Problem
Conventional flame-resistant additives, such as bromide-containing epoxy resins and antimony trioxide, pose health and environmental risks due to toxic gas emissions during burning, and phosphorus compounds are nearly insoluble in common solvents, making them inconvenient to process and apply.
Innovation Solution
A phosphorus compound with the formula (I), where Ar is a divalent group like biphenyl or diphenyl alkyl, reacts with alkylene carbonate or alkylene oxide in a solvent under heating to produce a highly soluble and thermally stable flame-resistant additive suitable for thermosetting or thermoplastic resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flame-resistant additives (bromide-containing epoxy resins and antimony trioxide) are used, then flame resistance is improved, but toxic gas emissions and health risks increase
Solution Approach 1:
The patent changes the chemical composition parameters by introducing phosphorus compounds with specific molecular structures (formula I) that have different combustion properties than conventional bromide-based additives. The phosphorus compound contains P-O-C bonds that decompose at high temperatures to form protective char layers rather than releasing toxic gases, thus maintaining flame resistance while eliminating harmful emissions
Solution Approach 2:
The invention creates a composite flame-retardant system by combining phosphorus compounds with epoxy resins and curing agents. The phosphorus compound acts as a synergistic additive that works together with the resin matrix to provide flame resistance through intumescent mechanisms, forming a protective foam layer that prevents oxygen access and heat penetration without releasing toxic substances
2Object-generated harmful factors
If phosphorus compounds are used as flame retardants, then environmental friendliness is improved, but solubility in common solvents deteriorates
Solution Approach 1:
The patent applies local quality by introducing specific hydrophilic functional groups (such as hydroxyl, carboxyl, or ether groups) at specific positions on the phosphorus compound molecule. These localized polar groups enhance solubility in common epoxy resin solvents without compromising the overall flame-retardant performance of the molecule, thus resolving the solubility issue while maintaining environmental friendliness
Solution Approach 2:
The invention changes the physical-chemical parameters of the phosphorus compound by modifying its molecular weight, introducing flexible alkyl chains, or adding solvent-compatible functional groups. These parameter adjustments increase the compound's compatibility with epoxy resin processing solvents, enabling easy incorporation into laminate materials without requiring specialized high-polarity solvents
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 resulting phosphorus compound exhibits high solubility in both high and low polarity solvents, offering improved processing convenience and enhanced thermal stability as a flame-resistant additive without toxic gas emissions.
Implementation Method 1
a compound of formula (II) reacts with alkylene carbonate or alkylene oxide in a solvent, and then the solvent is removed under heating to obtain a phosphorus compound of formula (I)
Implementation Method 2
the solvent is removed under heating to obtain a phosphorus compound of formula (I)
Data Source
AI summary
The present invention provides a phosphorus compound of formula (I).The phosphorus compound is prepared by reacting a compound of formula (II) with alkylene carbonate.As compared with the conventional phosphorus compounds as flame-resistant additives, the phosphorus compound of the present invention has not only a high pyrolysis temperature but also excellent solubility in most of the organic solvents with high or low polarity, and is therefore a suitable flame-resistant additive for use in thermosetting or thermoplastic resins.