Intumescent Coating Char Strength via Boric Acid
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Solution Overview
Problem
Conventional intumescent coatings face challenges in providing both strong and thermally insulating chars suitable for protecting structures from turbulent hydrocarbon fires, often requiring multiple layers and additives that compromise either strength or thermal protection.
Innovation Solution
A single-layer intumescent coating composition comprising 25.0-75.0 volume % of organic thermosetting polymer and curing agent, 1.0-70.0 volume % of phosphoric or sulphonic acid, 6.0-60.0 volume % of boric acid, and minimal or no melamine or isocyanurate derivatives, which forms a strong, hardwearing, and thermally insulating char without the need for reinforcing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional intumescent coatings use multiple layers and additives to improve thermal insulation, then thermal protection is improved, but coating complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines multiple functional components (polymer binder, acid source, charring agent, blowing agent) into a single-layer coating composition that simultaneously provides thermal insulation, structural integrity, and intumescent properties without requiring multiple separate coating layers
Solution Approach 2:
The coating uses a composite formulation combining specific polymers (polyester, polyamide, polyurethane) with acid sources (ammonium polyphosphate, metal phosphates) and charring agents (polyhydric alcohols) to create a unified material system that achieves multiple protective functions in one layer
2Strength
If conventional intumescent coatings use reinforcing materials to improve strength, then structural integrity is improved, but device complexity and cost increase
Solution Approach 1:
The coating composition is formulated to generate its own reinforcing structure through the intumescent reaction, where the blowing agent produces gas bubbles that create a foam structure providing inherent strength without requiring external reinforcing materials like mesh or fibers
Solution Approach 2:
The patent optimizes the chemical parameters of the coating composition, specifically the ratios of polymer binder, acid source, charring agent, and blowing agent, to control the intumescent reaction and produce a char layer with appropriate mechanical strength without added reinforcements
3Object-affected harmful factors
If conventional intumescent coatings use high amounts of fillers and pigments to prevent flame passage, then fire retardancy is improved, but the coating's ability to intumesce is inhibited
Solution Approach 1:
The patent removes or minimizes the use of flame-retardant fillers and pigments that would interfere with intumescent performance, focusing instead on a formulation where the polymer binder, acid source, charring agent, and blowing agent work together to produce effective thermal protection through controlled char formation
Solution Approach 2:
The patent converts the potential harm of high heat flux from hydrocarbon fires into a beneficial effect by using the heat to trigger the intumescent reaction, where the acid source and charring agent react to form a protective char layer that insulates the substrate
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 produces a durable, strong, and thermally insulating char that effectively protects against hydrocarbon fires, maintaining structural integrity and adhesion without cracking or delamination, even without a reinforcing mesh.
Implementation Method 1
When exposed to heat/fire, an intumescent coating forms a thick, porous highly insulative (non-flammable) solid foam barrier on the surface that it covers
Implementation Method 2
The coating slows the rate of temperature increase of the substrate to which the coating is applied. The coating thus increases the time before the structure fails due to the heat of fire
Implementation Method 3
The blowing agent produces a non-flammable gas (usually ammonia) when subjected to heat or flame. The gas evolved from the blowing agent serves to make the carbonaceous char expand to form a foam
Implementation Method 4
The charring or char forming agent (also known as a carbonific) reacts with the acid to form a carbonaceous char
Data Source
AI summary
A liquid intumescent coating composition comprising the following components: (a) 25.0-75.0 volume % of one or more organic thermosetting polymer(s) and one or more curing agent(s) for the organic thermosetting polymer(s), (b) 1.0-70.0 volume % of a source of phosphoric or sulphonic acid, (c) 6.0-60.0 volume % of a source of boric acid, (d) 0-2.0 volume % of melamine or melamine derivatives, (e) 0-1.0 volume % of one or more isocyanurate derivatives, wherein the volume % of components (a), (b), (c), (d) and (e) is calculated on the total volume of the non volatile components in the coating composition. The thermosetting intumescent coating composition is suitable for protecting substrates against hydrocarbon fires, for example jet fires. The coating composition can be used without a supporting mesh. The present invention also relates to substrates coated the intumescent coating composition, and a method of protecting structures from fire.