Intumescent Coating Composition for Engineered Wood Fire Protection
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Solution Overview
Problem
Current intumescent coatings are not suitable for engineered wood substrates like I-joists, which pose safety concerns under fire conditions due to burn-through and loss of structural integrity, necessitating a flame-retardant solution that meets specific fire performance standards.
Innovation Solution
A composition comprising expandable graphite compounds with specific particle size ratios, a binder with thermoplastic and thermoset compounds, a catalyst, and a blowing agent, designed to expand and form a thermal insulation layer when heated, suitable for wood substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If intumescent coatings are used to protect wood substrates, then fire resistance time is improved, but the coatings may not meet required fire performance standards for engineered wood substrates
Solution Approach 1:
The patent modifies the particle size parameters of expandable graphite compounds, using a bimodal distribution with particles ranging from 0.5-10 micrometers and 50-200 micrometers. This parameter optimization ensures the coating expands properly to achieve both adequate fire resistance time and compliance with fire performance standards for engineered wood substrates
Solution Approach 2:
The patent creates a composite intumescent coating system combining expandable graphite compounds with specific binders and additives. This composite formulation ensures reliable fire performance on engineered wood substrates while achieving the required burn-through time, resolving the contradiction between duration and standard compliance
2Volume of stationary object
If expandable graphite compounds with larger particle sizes are used, then coating expansion and insulation capability are improved, but coating uniformity and adhesion may deteriorate
Solution Approach 1:
The patent segments the expandable graphite particle size distribution into two distinct ranges: fine particles (0.5-10 micrometers) for uniform distribution and adhesion, and coarse particles (50-200 micrometers) for expansion volume. This segmentation allows the coating to achieve both good uniformity and sufficient insulation capability
Solution Approach 2:
The patent applies different particle sizes in specific roles: finer particles are distributed throughout the coating matrix to ensure uniformity and adhesion, while coarser particles provide the bulk expansion volume. This local quality differentiation resolves the contradiction between expansion volume and coating uniformity
3Duration of action of stationary object
If intumescent coating thickness is increased to improve fire resistance, then burn-through time is improved, but application complexity and cost increase
Solution Approach 1:
The patent optimizes the particle size parameters of expandable graphite to achieve maximum expansion efficiency. This allows the coating to achieve required burn-through times at thinner applications, reducing application complexity and cost while maintaining fire resistance performance
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 intumescent coating composition effectively increases the burn-through time of wood substrates, providing adequate time for evacuation and fire control by forming a low-density insulation layer, meeting the required fire retardancy standards.
Implementation Method 1
the formation of a protective layer which alters the heat flux to the substrate and can inhibit its thermal degradation, ignition, or combustion
Implementation Method 2
Intumescent coatings expand under the influence of heat to form a multicellular charred layer which acts as an insulating barrier
Implementation Method 3
a blowing agent
Implementation Method 4
a catalyst
Implementation Method 5
a binder comprising: i) a thermoplastic compound and ii) a thermoset compound
Implementation Method 6
The intumesced char can expand up to 50 times the original thickness of the applied coating. It can insulate the substrate
Data Source
AI summary
A coating composition comprising: a) a first expandable graphite compound having a mean particle size in the range of from 300 microns to 1000 microns; b) a second expandable graphite compound having a mean particle size in the range of from 0.5 microns to 250 microns; c) a binder comprising: i) a thermoplastic compound and ii) a thermoset compound; d) a catalyst; and e) a blowing agent, is disclosed.