Polyurea Intumescent Coating for Rapid Fire Protection
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Solution Overview
Problem
Existing intumescent fire protection coatings for steel structures have long curing times, require multiple layers, and can crack or peel due to solvent or water evaporation, leading to increased costs and reduced fire resistance, while epoxy-amine systems form rigid polymer matrices that hinder foam formation and require high processing temperatures.
Innovation Solution
A solvent- and water-free intumescent composition with a polyurea-based binder, containing an isocyanate compound, a reactive polyaspartic acid ester, and an intumescent-forming additive mixture that includes a carbon supplier, dehydrogenation catalyst, and blowing agent, allowing for rapid curing and thin layer application with high intumescence rates and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If solvent or water-based intumescent coatings are used, then the coating can be applied and dried, but the drying times are long and multiple layers have to be applied, leading to increased working time and costs
Solution Approach 1:
The patent changes the chemical composition parameters by using a solvent-free system with specific binder combinations (polyester resin with epoxy-amine or polyisocyanate-polyol) that enable rapid curing without solvents or water, eliminating drying time and reducing the number of application layers needed
Solution Approach 2:
The patent employs composite binder systems combining multiple resin types (polyester, epoxy, polyisocyanate, polyol) with intumescent additives to create a coating that cures rapidly through chemical reaction rather than evaporation, achieving both ease of manufacture and reduced drying time
2Reliability
If solvent or water-based coatings are applied in thick layers to achieve required fire resistance, then the fire protection is sufficient, but the coating tends to crack and peel off during drying or heat exposure
Solution Approach 1:
The patent changes the curing mechanism from physical drying (evaporation) to chemical curing (polymerization and crosslinking), allowing the coating to achieve the required thickness in a single application without the cracking and peeling associated with solvent or water evaporation
Solution Approach 2:
The patent uses composite binder systems with intumescent additives that create a cohesive, crosslinked matrix structure resistant to cracking and peeling while maintaining the required fire resistance properties
3Loss of time
If epoxy-amine systems are used to reduce drying time, then curing occurs quickly, but the binder forms a very stable and rigid polymer matrix that hinders foam formation
Solution Approach 1:
The patent combines epoxy-amine or polyisocyanate-polyol binders with specifically formulated intumescent additives (carbon suppliers, dehydrogenation catalysts, blowing agents) in optimized ratios that allow rapid curing while maintaining the ability to form voluminous foam for intumescence
Solution Approach 2:
The patent adjusts the chemical composition parameters of the binder and additive mixture to balance cure speed with foam formation capability, using controlled crosslinking density and additive concentration to prevent overly rigid matrix formation
4Reliability
If thick layers of coating are applied to achieve sufficient foam thickness for insulation, then the fire resistance is improved, but a lot of material is required and costs increase
Solution Approach 1:
The patent optimizes the intumescence factor by adjusting binder composition, additive concentration, and molecular weight parameters to maximize foam expansion ratio, allowing thin layers to achieve the required insulation thickness and fire resistance
Solution Approach 2:
The patent uses composite formulations with high intumescence performance through optimized combinations of binders and additives that generate voluminous foam with excellent insulation properties, reducing the amount of coating material needed
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 composition achieves rapid curing, high intumescence rates, and excellent adhesion and cohesion to substrates, reducing material costs and maintaining mechanical stability even with thin layers, while avoiding the drawbacks of traditional systems.
Implementation Method 1
They are applied to the component, with the coating only 'drying' through the reaction of the binder components with each other
Implementation Method 2
These are paints whose components foam in the event of fire to form a solid microporous carbon foam. This forms a fine-pored and thick foam layer, the so-called ash crust, which, depending on the composition, is highly heat-insulating and thus delays the heating of the component
Implementation Method 3
a carbon supplier, dehydrogenation catalyst, and blowing agent
Implementation Method 4
a carbon supplier, dehydrogenation catalyst, and blowing agent
Data Source
AI summary
The invention relates to a composition which forms an insulating layer and which contains a binder based on polyurea. By means of the composition according to the invention, the expansion rate of which is relatively high, coatings having the layer thickness required for the particular fire resistance duration can be applied simply and quickly, wherein the layer thickness can be reduced to a minimum and nevertheless a large insulating effect can be achieved. The composition according to the invention is suitable especially for fire protection, in particular as a coating of metal and non-metal substrates, for example steel components such as supports, beams, and truss members, for increasing the fire resistance duration.