Intumescent Coating Composition for Steel Fire Protection
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Solution Overview
Problem
Existing intumescent coating systems face challenges such as long curing times, inhomogeneous curing, and high material requirements due to their dependence on solvents, water, or humidity, which can lead to defects and increased costs in achieving the required fire resistance duration for steel structures.
Innovation Solution
A composition comprising an aqueous polymer dispersion and an alkoxy-functional organic polymer with silane groups, combined with an intumescent compound mixture, which allows for fast, homogeneous curing and high film thickness without the need for solvent-based systems, ensuring thermal stability and bond strength without VOCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If solvent or aqueous systems are used for intumescent coating, then the coating can be applied with lower viscosity and better flow properties, but the drying times are long and multiple layers must be applied to achieve the required thickness
Solution Approach 1:
The patent changes the chemical composition parameters by using a 100% solid system with reactive binders (epoxy, polyurethane, polyester) instead of solvent-based systems. This eliminates the need for drying time while maintaining coating applicability through proper viscosity control of the reactive mixture.
Solution Approach 2:
The invention extracts and eliminates the solvent or water component from the coating system entirely, using a 100% solid composition. This removal of the volatile carrier eliminates the drying step while the reactive components provide self-thinning properties for proper application.
2Manufacturing precision
If multiple layers are applied to achieve required thickness in solvent or aqueous systems, then the maximum thickness per coat is limited to approximately 1 to 1.5 mm, but this leads to high expenditure of labor and correspondingly high costs
Solution Approach 1:
The patent formulates the coating with high solids content (100%) and appropriate rheological properties so that a single thick application can be made without sagging or running. The reactive binder system allows the coating to remain workable during application while preventing premature skin formation, enabling one-coat applications at thicknesses exceeding 1.5 mm.
Solution Approach 2:
The invention uses a composite binder system combining epoxy, polyurethane, and polyester components with intumescent additives. This composite formulation provides both the structural integrity needed for thick single-coat application and the fire-protection functionality, eliminating the need for multiple layers.
3Reliability
If the coating layer thickness is increased to achieve required fire resistance duration, then the insulating effect is improved, but the coating may gravitate during drying or exposure to heat, resulting in cracking and flaking
Solution Approach 1:
The patent changes the chemical composition to a 100% solid reactive system that cures through polymerization rather than solvent evaporation. This eliminates the drying shrinkage and film tension that cause cracking and flaking. The high crosslink density of the cured reactive binder provides both the thickness needed for fire resistance and the mechanical integrity to prevent coating failure.
Solution Approach 2:
The invention replaces the long-lived but problematic solvent-based system with a short-lived reactive mixture that cures in place. The reactive components react completely to form a durable, crack-free coating, eliminating the need for thick applications that would otherwise gravitate and fail during the extended drying period of solvent-based systems.
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 solution enables rapid curing and high film thickness with improved mechanical stability and bond strength, reducing labor and costs while maintaining effective fire resistance without the use of solvents or VOCs, thus overcoming the limitations of traditional systems.
Implementation Method 1
The binder is a reactive system, comprising an aqueous polymer dispersion and an alkoxy-functional organic polymer, which cures upon contact with water
Implementation Method 2
an alkoxy-functional organic polymer, which contains alkoxy-functional silane groups
Implementation Method 3
whose components form a solid microporous carbon foam in the event of fire
Implementation Method 4
this forms a fine-pored and thick foam layer, the so-called ash crust
Implementation Method 5
which, depending on the composition, is highly thermally insulating. Thus the heating of the component is delayed
Data Source
AI summary
A composition for an intumescent coating contains (A) a binder system, and (B) an intumescent composition. The hinder system contains (a1) an aqueous polymer dispersion; and (a2) an alkoxy-functional organic polymer, which contains alkoxy-functional silane groups. The composition is useful as a coating, in particular a fire-protection coating.