Powder Primer for Intumescent Fire Protection
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Solution Overview
Problem
Existing primer coatings for intumescent fire protection on steel structures are prone to damage, especially in off-site application and during the drying process, and fail to provide adequate adhesion for intumescent coatings under heat or fire conditions.
Innovation Solution
A powder primer composition is developed, consisting of an extruded and ground mixture of binding agents, hardening agents, and a porous material like diatomaceous earth, which is bonded into the powder coating composition to enhance adhesion and durability, applied electrostatically and cured by baking or radiative energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If liquid primer coatings are used, then application is straightforward, but the coating is prone to damage and difficult to repair
Solution Approach 1:
The patent changes the physical state of the primer from liquid to powder form. This parameter change fundamentally alters the coating's properties: powder coatings are applied as dry particles and then cured to form a durable, cross-linked network that resists damage, while eliminating the vulnerabilities of liquid coatings during the wet drying phase.
Solution Approach 2:
The patent utilizes phase transition in the curing process where the powder primer transforms from a dry particulate state to a solid, cross-linked coating structure through thermal or radiative curing. This phase transition creates a robust coating that maintains both ease of application and high damage resistance.
2Ease of operation
If liquid primer coatings are used, then application is simple, but significant repair is required after erection
Solution Approach 1:
By changing from liquid to powder form, the coating achieves superior durability and adhesion properties that minimize the need for repairs. The powder coating system creates a more robust primer layer that better withstands environmental conditions and structural movements, thereby reducing maintenance requirements.
3Speed
If wet coating is applied on-site, then immediate coverage is achieved, but the coating must dry and is easily damaged
Solution Approach 1:
The patent eliminates the vulnerable wet drying phase by using powder coatings that are applied as dry particles. The coating remains in a stable dry state during application and only undergoes phase transition to solid during controlled curing, thereby achieving immediate coverage without the intermediate vulnerable wet stage.
Solution Approach 2:
The powder primer is pre-formulated with all necessary components in a stable dry state before application. This preliminary preparation ensures that the coating does not require a vulnerable drying phase, as the reactive components are already in place and will only react during controlled curing after application.
4Reliability
If conventional powder coatings are used, then durability is improved, but adhesion of intumescent coating under heat is insufficient
Solution Approach 1:
The patent incorporates porous silica gel particles into the powder primer composition. These porous materials create a rougher, more textured surface that mechanically interlocks with the intumescent coating, significantly improving adhesion strength while maintaining the durability benefits of powder coating.
Solution Approach 2:
The patent creates a composite powder primer by combining conventional powder coating materials with porous silica gel particles. This composite structure provides both the durability of powder coating and the enhanced adhesion properties of porous materials, solving the contradiction between durability and adhesion strength.
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 powder primer composition provides a durable, solvent-free, and environment-friendly coating that significantly improves the adhesion of intumescent fire protecting coatings, maintaining adherence under heat or fire conditions, and passes fire protection tests according to EN 13381-8 and EN 1363-1 standards.
Implementation Method 1
The porous material is mesoporous or microporous... provides a durable, solvent-free, and environment-friendly coating that significantly improves the adhesion of intumescent fire protecting coatings, maintaining adherence under heat or fire conditions
Implementation Method 2
applied electrostatically and cured by baking or radiative energy
Implementation Method 3
cured by baking or radiative energy
Data Source
AI summary
A primer composition for coating a substrate prior to application thereon of an intumescent fire protecting coating composition, the primer composition being a powder coating composition consisting of an extruded and subsequently ground mixture of binding agents, hardening agents and optionally one or more of optional pigments, optional filler, and optional additives, and a porous material in a proportion of one to twelve percent by weight of the powder coating composition. The porous material is mesoporous or microporous.