Polyisocyanurate Fire Door Profiles Carbonization Mechanism
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Solution Overview
Problem
Current polyurethane and polyisocyanurate systems fail to meet fire safety standards due to inadequate mechanical resistance and excessive smoke generation when exposed to flames, leading to structural instability and poor visibility during emergencies.
Innovation Solution
A polyisocyanurate composition with an isocyanate index between 200 and 400, using aromatic polyester polyols and high-functionality aromatic isocyanates, along with specific catalysts and flame retardants, is developed to create a compact, self-sustaining carbonaceous structure that maintains mechanical integrity and minimizes smoke production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional polyurethane and polyisocyanurate systems are used, then the material provides basic insulation properties, but it generates excessive smoke and loses mechanical resistance when exposed to flames
Solution Approach 1:
The patent changes the chemical composition parameters by using aromatic polyester polyols with specific hydroxyl numbers (200-400 mg KOH/g) and high functionality (2.5-3.0), combined with polyisocyanates at high isocyanate indices (200-400), to fundamentally alter the material's fire response characteristics and reduce smoke generation
Solution Approach 2:
The patent creates a composite polymer system combining aromatic polyester polyol, polyisocyanate, trimerisation catalyst, and flame retardant additives to achieve synergistic effects that simultaneously provide fire resistance, low smoke emission, and maintained mechanical integrity
2Strength
If conventional polyisocyanurate is used, then the material provides flame resistance, but it fails to maintain mechanical integrity and structural stability under fire conditions
Solution Approach 1:
The patent optimizes the isocyanate index parameter to a high range (200-400) and selects polyols with specific molecular weight and hydroxyl number ranges to create a cross-linked polymer network that maintains strength at elevated temperatures
Solution Approach 2:
The patent converts the harmful effect of heat exposure into a beneficial carbonization process, where the aromatic polyester polyol structure promotes formation of a protective carbonaceous char layer that insulates the underlying material and maintains structural integrity during fire exposure
3Reliability
If the polyisocyanurate composition is optimized for fire resistance, then flame resistance improves, but the complexity of the composition increases
Solution Approach 1:
The aromatic polyester polyol serves multiple functions simultaneously: it provides the polymer backbone structure, contributes to fire resistance through aromatic ring stability, enables controlled carbonization, and works synergistically with the flame retardant additives, reducing the need for separate functional components
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 polyisocyanurate-based profiles for fire doors and windows exhibit high flame resistance, carbonize into a hard, mechanically robust structure that withstands heat dilatations and maintains structural integrity, while also reducing dense smoke formation, thus complying with stringent fire safety standards.
Implementation Method 1
carbonize into a hard, mechanically robust structure that withstands heat dilatations and maintains structural integrity
Implementation Method 2
withstands heat dilatations and maintains structural integrity
Data Source
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Figure 4a~5b
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AI summary
The invention regards a composition for preparing a polyisocyanurate consisting of: a) aromatic polyisocyanates; b) compounds having groups reactive towards isocyanates; c) possible additives.