Modified Clay-Polymer Composite Flame Retardant
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Solution Overview
Problem
Conventional polymer materials used in electronic packages and other applications are prone to damage and smoke production when heated, leading to environmental concerns due to the use of brominated resins as flame retardants, necessitating the development of halogen and phosphate-free alternatives.
Innovation Solution
A modified clay-polymer composite is created by intercalating a modifier with a conjugated double bond into a layered clay material, which produces free radicals upon heating to scavenge radicals generated from thermal cracking or burning, thereby enhancing the flame-retardant properties and structural stability of the polymer material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brominated resin is added to polymer materials for flame retardation, then flame-retardant properties are improved, but toxic smoke and corrosive gases are generated causing environmental problems
Solution Approach 1:
The patent converts the harmful effect of free radicals (which cause thermal cracking) into a beneficial mechanism by using modifiers that generate free radicals at controlled temperatures to scavenge more harmful radicals from polymer degradation, thereby achieving flame retardation without toxic substances
Solution Approach 2:
The patent changes the chemical structure parameters of the clay modifier by introducing conjugated double bonds, which fundamentally alters the thermal behavior from harmful (uncontrolled radical generation) to beneficial (controlled radical scavenging at specific temperature ranges)
2Reliability
If conventional clay is added to polymer to form coke layer, then flame-retardant properties are improved, but the clay does not effectively prevent thermal cracking without additional flame retardants
Solution Approach 1:
The modified clay serves multiple functions simultaneously: it forms a protective coke layer barrier, scavenges free radicals to prevent thermal cracking, and provides structural reinforcement, eliminating the need for separate flame retardant additives
Solution Approach 2:
The patent creates a composite material system where organic modifiers with conjugated double bonds are intercalated into clay structures, combining the barrier properties of clay with the radical-scavenging capabilities of the organic modifier
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 modified clay-polymer composite exhibits improved flame-retardant properties, with reduced heat release rates and increased limiting oxygen index, effectively preventing further thermal cracking and enhancing the material's ability to withstand heat without producing toxic smoke.
Implementation Method 1
the modifier has a conjugated double bond and is capable of producing free radicals when heated
Implementation Method 2
the modifier is capable of producing free radicals when heated to scavenge free radicals generated from thermal cracking or burning of the polymer material
Implementation Method 3
to prevent further thermal cracking of the polymer material
Data Source
AI summary
A modified clay is provided, which includes a layered clay material intercalated with a modifier having a conjugated double bond and capable of producing free radicals when heated. A clay-polymer composite is also provided, which includes a polymer material and the modified clay, wherein the modified clay is dispersed in the polymer material and at least partially exfoliated. The modifier is capable of producing free radicals when heated to scavenge free radicals generated from thermal cracking or burning of the polymer material to prevent further thermal cracking of the polymer material.