Melamine Thiosulfate Synergist for Odorless Flame Retardancy
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Solution Overview
Problem
Sulfur-containing flame retardants often have a strong odor, limiting their application in various fields, and not all sulfur compounds exhibit synergistic flame-retardant effects when combined with other known flame retardants.
Innovation Solution
Development of melamine thiosulfate, which is virtually odorless and produced by reacting melamine with sodium thiosulfate in the presence of an acid, acts as a synergist when combined with known flame retardants, enhancing their flame-retardant properties in plastics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfur-containing compounds are used as flame retardants, then flame-retardant effect is improved, but odor increases
Solution Approach 1:
The patent creates a composite material by combining melamine (a nitrogen-containing compound) with thiosulfate (a sulfur-containing compound) to form melamine thiosulfate. This composite structure integrates the flame-retardant properties of sulfur compounds with the odor-neutral characteristics of melamine derivatives, resolving the contradiction between effectiveness and odor.
Solution Approach 2:
The invention changes the chemical parameters of conventional thiosulfate compounds by introducing melamine groups, transforming it from a small inorganic ion to an organic compound with different volatility and odor characteristics while maintaining the S-S bonds necessary for flame retardancy.
2Reliability
If conventional thiosulfates are used as flame retardants, then flame-retardant effect is achieved, but substance-specific synergism is limited
Solution Approach 1:
Melamine thiosulfate exhibits universal synergistic effects with multiple different flame retardant compounds including DOPO derivatives, phosphorus compounds, and nitrogen-containing compounds. The melamine structure provides multiple interaction sites that can work synergistically with various flame retardant mechanisms, making it broadly adaptable rather than substance-specific.
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
Melamine thiosulfate demonstrates a strong synergistic effect when combined with other flame retardants, significantly reducing afterburning time in plastics, making it suitable for improving fire protection in polymers while being odorless and suitable for use in plastics.
Implementation Method 1
melamine is reacted with sodium thiosulfate in the presence of an acid, preferably a strong acid such as hydrochloric acid or phosphoric acid. Through such a salting process, melamine thiosulfate can be obtained in good yields and in high purity.
Implementation Method 2
melamine thiosulfate has proven to be virtually odorless in tests for its flame retardant effect
Data Source
AI summary
The invention relates to melamine thiosulfate or bis(2,4,6-triamino-1,3,5-triazinium)thiosulfate, to methods for producing the same and to the use thereof as flame retardant, particularly as a synergist for known flame retardants.