Polysiloxane Intumescent Coating for Fire Resistance and Hardness
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Solution Overview
Problem
Existing intumescent coatings based on epoxy binders fail to provide sufficient fire protection and hardness development, leading to rapid structural failure in high-temperature scenarios, with typical time to failure ranging from 45 to 65 minutes.
Innovation Solution
A polysiloxane-based intumescent coating composition comprising epoxy-functional and amino-functional polysiloxanes, along with a catalyst, which enhances fire protection and hardness development by promoting crosslinking and homopolymerization, achieving a time to failure of 75 to 150 minutes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epoxy-based binder systems are used in intumescent coatings, then the coating provides fire protection, but the hardness development is insufficient and time to failure remains limited (45-65 minutes)
Solution Approach 1:
The patent employs a composite binder system combining polysiloxane and epoxy resin. The polysiloxane component (5-50 wt%) contributes to enhanced hardness development and thermal stability, while the epoxy resin (50-95 wt%) provides the necessary adhesion and fire protection properties. This composite approach allows simultaneous improvement of both hardness and fire resistance that neither material could achieve alone.
Solution Approach 2:
The patent modifies the chemical composition parameters of the binder system by introducing polysiloxane with specific molecular weights (1,000-1,000,000 g/mol) and functional groups (hydroxyl, epoxy, amino). By controlling the polysiloxane content at 5-50 wt% and adjusting its molecular weight and functionality, the coating achieves optimized hardness development while maintaining fire protection performance.
2Ease of operation
If epoxy-based binder systems are used in intumescent coatings, then the coating can be applied to steel substrates, but the time to structural failure is insufficient (45-65 minutes)
Solution Approach 1:
The composite polysiloxane-epoxy binder system extends the duration of fire protection to 75-150 minutes. The polysiloxane component enhances thermal stability and char formation, while the epoxy ensures proper adhesion to steel substrates. This combination allows the coating to maintain protective function for extended periods while remaining easy to apply.
Solution Approach 2:
By adjusting the polysiloxane molecular weight (1,000-1,000,000 g/mol) and functional group content (hydroxyl, epoxy, amino groups), the patent optimizes both the coating's applicability and its duration of fire protection. The specific parameter ranges enable extended fire resistance while maintaining ease of application to steel substrates.
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 polysiloxane-based coating composition provides excellent fire protection and rapid hardness development, extending the time to structural failure significantly beyond existing epoxy-based coatings, with improved performance in various fire scenarios.
Implementation Method 1
enhances fire protection and hardness development by promoting crosslinking and homopolymerization
Implementation Method 2
enhances fire protection and hardness development by promoting crosslinking and homopolymerization
Implementation Method 3
When intumescent coatings are exposed to fire or heat, and the temperature of the coating exceeds for example 200° C., the acid generating compound decomposes to provide an acid, and a carbon source reacts with the acid to form a carbonaceous char
Implementation Method 4
An intumescent coating acts by expanding or swelling when exposed to heat, thereby substantially extending the time before the substrate is damaged by the fire
Data Source
AI summary
A polysiloxane based intumescent coating composition includes a) a polysiloxane based binder system having i) one or more epoxy-functional polysiloxane; and b) one or more catalyst. Said a) polysiloxane based binder system may further comprise ii) one or more amino-functional polysiloxane. The coating composition is used for application on a substrate's surface. A substrate may be a steel substrate having on the surface a coat obtained from the coating composition of the invention. A kit of parts is for preparation of a polysiloxane based intumescent coating composition.