Oxidized Phosphorus-Nitrogen Flame Retardant for Stable Polyamide Processing
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Solution Overview
Problem
Conventional halogen-free flame retardants face issues such as corrosiveness, high cost, environmental hazards, color limitations, and instability in polyamide systems, particularly at high compounding temperatures.
Innovation Solution
A process involving the reaction of melamine or melamine derivatives with bis[tetrakis(hydroxymethyl)phosphonium] sulfate, followed by oxidation, to produce a flame retardant with stable tertiary phosphine oxide, which is then used in polymer compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal phosphinates plus N-synergists are used as flame retardants, then flame retardant properties are improved, but corrosiveness to compounding machines increases and cost increases
Solution Approach 1:
The patent changes the chemical parameters by using organic phosphites instead of metal phosphinates, eliminating metal ions that cause corrosion while maintaining flame retardant effectiveness through organic phosphorus compounds
Solution Approach 2:
The patent employs readily available organic phosphites and nitrogen-containing compounds that can be easily synthesized or obtained, reducing dependency on expensive specialized additives like metal phosphinates
2Reliability
If red phosphorus is used as flame retardant, then flame retardant properties are improved, but environmental hazards increase due to PH3 production and stability decreases
Solution Approach 1:
The patent converts the potential harm of phosphorus compounds by using organic phosphites that decompose into non-toxic phosphoric acid and water instead of hazardous PH3 gas, transforming a potentially harmful substance into a safe flame retardant system
Solution Approach 2:
The patent creates a composite flame retardant system combining organic phosphites with nitrogen-containing compounds, where the synergistic interaction between phosphorus and nitrogen provides enhanced flame retardancy without the environmental hazards of red phosphorus
3Reliability
If conventional flame retardants are used in polyamide systems, then flame retardant properties are improved, but thermal stability decreases at high compounding temperatures
Solution Approach 1:
The patent modifies the thermal stability parameter by selecting organic phosphites with appropriate molecular structures and stability characteristics that can withstand polyamide processing temperatures without degradation, while maintaining flame retardant efficacy
Solution Approach 2:
The patent performs preliminary stabilization by using phosphites that are pre-formulated to be thermally stable, preventing degradation before the material undergoes compounding processing
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 flame retardant exhibits excellent flame retardancy and thermal stability, with reduced weight loss and improved performance in polyamide and glass fiber reinforced polybutylene terephthalate systems.
Implementation Method 1
adding an oxidant to the reaction product in (i) and reacting the mixture to obtain the flame retardant
Data Source
AI summary
The present disclosure provides a process for preparing a flame retardant, a flame retardant obtained by the process and use of the flame retardant in a polymer composition.