Polyurea Coating Flame Resistance via Isocyanate Ratio
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Solution Overview
Problem
Polyurea and polyurethane coatings lack adequate flame and heat resistance, making them unsuitable for applications requiring protection against combustion and high temperatures.
Innovation Solution
A coating composition comprising polyurea formed from a reaction mixture of isocyanate and amine with a ratio of isocyanate groups to amine groups greater than 1, applied at a 1:1 volume mixing ratio, optionally including polyurethane and a flame retardant, to enhance flame and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyurea and polyurethane coatings are used to protect substrates, then corrosion and abrasion resistance are improved, but flame and heat resistance deteriorate
Solution Approach 1:
The patent creates a composite coating system by combining polyurea and polyurethane resins with flame retardant additives. This composite approach allows the coating to simultaneously provide the protective properties of polyurea/polyurethane (corrosion and abrasion resistance) while incorporating flame retardant mechanisms (phosphorus-containing compounds, halogenated agents) to achieve flame and heat resistance, thus resolving the contradiction between mechanical protection and fire safety
Solution Approach 2:
The patent introduces flame retardant compounds as intermediary substances within the coating matrix. These flame retardants act as mediators that interfere with the combustion process through chemical mechanisms (forming protective char layers, releasing flame-inhibiting gases) while maintaining the structural integrity and protective functions of the polyurea/polyurethane base coating, thereby enabling both protection and fire resistance
2Strength
If polyurea coating is applied for substrate protection, then mechanical protection is improved, but combustibility increases
Solution Approach 1:
The patent converts the harmful combustibility of polyurea into a benefit by incorporating flame retardant additives that trigger protective mechanisms when exposed to fire. These additives transform the coating's response to heat from passive burning to active protection through char formation and flame inhibition, thus converting the harmful property (combustibility) into a beneficial one (fire resistance) while preserving mechanical protection
3Object-affected harmful factors
If flame retardant is added to polyurea/polyurethane coating, then flame and heat resistance are improved, but coating composition complexity increases
Solution Approach 1:
The patent merges the flame retardant functionality with the existing polyurea/polyurethane coating system by incorporating flame retardant additives directly into the coating composition. This consolidation approach integrates multiple functions (protection and fire resistance) into a single unified coating product, reducing the need for separate fireproofing treatments and simplifying the overall system despite the enhanced composition
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 coating composition demonstrates improved flame and heat resistance, providing enhanced protection against combustion and high temperatures, suitable for various industrial and military applications.
Implementation Method 1
The flame retardant phosphoric acid has been shown to react with the polymer to which it is applied to form a strong chemical bond
Implementation Method 2
The flame retardant phosphoric acid has been shown to react with the polymer to which it is applied to form a strong chemical bond and provide thermal insulation
Data Source
AI summary
The present invention is directed to a coating composition comprising polyurea and polyurethane. Further, the present invention is directed to a coating composition comprising polyurea or, polyurea and polyurethane, and flame retardant. The polyurea is formed from a reaction mixture comprising isocyanate and amine wherein the ratio of equivalents of isocyanate groups to equivalents of amine groups is greater than 1 and the isocyanate-functional component and the amine-functional component can be applied to a substrate at a volume mixing ratio of 1:1.