End-Capped Melamine Pyrophosphate Flame Retardant
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Solution Overview
Problem
Current melamine pyrophosphate flame retardants face challenges with temperature resistance and precipitation resistance, which are not fully met for practical applications.
Innovation Solution
A chemically end-capped melamine pyrophosphate with high temperature resistance and precipitation resistance is developed, where the melamine pyrophosphate is end-capped by a nitrogen-containing compound, and a specific synthesis method involving thermal polymerization and thermal treatment is employed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If melamine pyrophosphate is prepared by solid-phase synthesis method through direct dehydration of melamine phosphate, then the synthesis process is simplified, but mass transfer and heat transfer become difficult and production is challenging
Solution Approach 1:
The patent transforms the solid-phase synthesis into a liquid-phase reaction by dissolving melamine phosphate in water to form a slurry, then controlling evaporation and condensation parameters to achieve pyrophosphate formation. This parameter change from solid to liquid phase resolves the mass transfer and heat transfer difficulties while maintaining process simplicity.
2Reliability
If conventional melamine pyrophosphate is used, then the basic flame-retardant function is achieved, but temperature resistance and precipitation resistance are insufficient for practical applications
Solution Approach 1:
The patent creates a composite structure by chemically bonding melamine pyrophosphate with reactive oligosiloxane containing hydroxyl groups. This composite material combines the flame-retardant properties of melamine pyrophosphate with the thermal stability and water resistance of siloxane, achieving both reliable flame retardancy and improved temperature/precipitation resistance.
Solution Approach 2:
The patent replaces physical mixing of flame retardant components with chemical bonding through condensation reactions between hydroxyl groups on siloxane and reactive groups on melamine pyrophosphate. This chemical substitution creates a stable integrated structure that prevents precipitation and enhances thermal resistance.
3Ease of manufacture
If melamine pyrophosphate is synthesized without end-capping, then the synthesis is straightforward, but the product lacks sufficient water resistance and thermal stability
Solution Approach 1:
The patent incorporates end-capping groups (hydroxyl-containing siloxane) during the synthesis process itself rather than as a separate post-treatment step. This preliminary action ensures that the melamine pyrophosphate chains are capped with water-resistant and thermally stable groups throughout the material, achieving both ease of manufacture and improved reliability.
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 chemically end-capped melamine pyrophosphate exhibits improved water resistance, temperature resistance, and flame retardancy, with a nitrogen content greater than 42%, and can be used in continuous scale-up production ensuring product whiteness and thermal stability.
Implementation Method 1
dehydrating melamine phosphate by thermal polymerization to obtain melamine pyrophosphate
Implementation Method 2
dehydrating melamine phosphate by thermal polymerization
Implementation Method 3
performing thermal treatment of the melamine pyrophosphate and the end-capping reagent
Implementation Method 4
the melamine pyrophosphate is end-capped by an end-capping reagent
Data Source
AI summary
Disclosed are chemically end-capped melamine pyrophosphate with high temperature resistance and precipitation resistance, a preparation method and apparatus thereof, and an application thereof in flame-retardant nylon. End-capping treatment of melamine pyrophosphate enhances flame retardancy and precipitation resistance of a flame retardant, and melamine pyrophosphate is used for producing high-strength flame-retardant nylon, which improves product performance. A special flame-retardant preparation device is also used, and appropriate process flow and parameter design further improves comprehensive properties of the flame retardant, including whiteness and a 1% thermal decomposition temperature. The present technical solution can overcome technical defects of the melamine pyrophosphate flame retardant in the prior art including non-ideal properties in a flame retardant effect and stability, as well as difficulty to improve the comprehensive properties of the flame-retardant nylon. The process is simple but ideal in the effect, and is suitable for a wide range of applications.