High-Temperature Surface Coating for Gas-Tight Thermal Insulation
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Solution Overview
Problem
Existing thermal insulation schemes are not suitable for high-temperature surfaces in potentially explosive atmospheres as they are not gas and dust tight, leading to risks of fire and explosions, and lack efficiency and cost-effectiveness.
Innovation Solution
A multi-layer coating system comprising a moldable fire-proof thermal-insulation material (HANDEX) made from Granulated Rockwool and Expanded Vermiculite, combined with a non-flammable thermo-glass fabric (FIBEREX+GLUEX) and an incombustible phenolic resin (NOREX) to create a gas and dust tight, corrosion-resistant thermal insulation layer that reduces surface temperature below 135°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal insulation schemes are used on high-temperature surfaces, then thermal insulation is provided, but the insulation is not gas and dust tight, allowing flammable substances to contact hot surfaces and cause fire or explosion
Solution Approach 1:
The patent applies a multi-layer composite coating system consisting of: (1) a thermal insulation layer made of granulated rockwool and expanded vermiculite, (2) a binding layer comprising phenolic resin and glass fiber fabric, and (3) an optional protective top layer. This composite structure combines materials with complementary properties to achieve both thermal insulation and gas/dust tightness, resolving the contradiction between insulation performance and sealing capability.
Solution Approach 2:
The patent employs a flexible binding layer made of phenolic resin impregnated glass fiber fabric that conforms to the substrate surface and creates a sealed barrier. This flexible film-like layer bridges gaps and cracks in the rigid insulation layer, preventing gas and dust penetration while maintaining the thermal insulation function, thus resolving the contradiction between structural rigidity and sealing flexibility.
2Reliability
If thermal insulation layers are applied to reduce surface temperature, then fire safety is improved, but the coating system becomes complex and difficult to manufacture
Solution Approach 1:
The patent employs pre-formed glass fiber fabric mats that are impregnated with phenolic resin before application. This preliminary preparation of the binding layer allows for easier and more consistent application to the substrate, reducing on-site manufacturing complexity while maintaining the multi-layer composite structure necessary for fire safety.
Solution Approach 2:
The phenolic resin-impregnated glass fiber fabric acts as an intermediary layer that bonds the rigid insulation granules to the substrate and provides structural integrity. This intermediary binding layer simplifies the overall application process by combining multiple functions (adhesion, sealing, and additional insulation) into a single applyable component.
3Reliability
If existing insulation materials are used, then thermal insulation is achieved, but the materials are not corrosion resistant in harsh environments
Solution Approach 1:
The patent uses a composite system where phenolic resin (a chemically resistant polymer) binds glass fiber fabric to the insulation layer. The phenolic resin provides excellent corrosion and chemical resistance properties that protect the underlying insulation materials from degradation in harsh environments, while the glass fiber fabric adds structural stability and resistance to mechanical and chemical attack.
Solution Approach 2:
The binding layer acts as a sacrificial protective barrier that protects the more valuable insulation layer from corrosion. By designing the binding layer to be applied in direct contact with the substrate and environment, it absorbs the corrosive effects, extending the service life of the entire coating system while maintaining cost-effectiveness.
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 system effectively reduces the external surface temperature of high-temperature components to a safe level, providing fireproof, gas and dust tight, and corrosion-resistant thermal insulation while being cost-effective and suitable for use in potentially explosive environments.
Implementation Method 1
thermal insulation layer that reduces surface temperature below 135°C
Data Source
AI summary
Novel fire-proof thermal-insulation coating materials are disclosed formed primarily by mixing granulated Rockwood with liquid vermiculite (i.e., expanded vermiculite mixed with water). Also disclosed are methods for producing the coating materials and for applying the novel coating materials and additional layers to selected surfaces which can reach excessive temperatures (e.g., above 135° C.) so as to limit the maximum temperature of the outer exposed surfaces of the coating layers.