FKM-Coated Transfer Hose for VOC-Free High-Temperature Protection
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Solution Overview
Problem
Transfer hoses used in high-temperature applications face issues with existing coatings, such as thermal decomposition of acrylate coatings, high material costs without coatings, contamination, and VOC emissions from silicone and FKM solutions, which are energy-intensive and harmful.
Innovation Solution
A process for producing a transfer hose coated with FKM using an aqueous FKM dispersion containing a crosslinking agent like polyamine or monomeric/oligomeric aminosilane, which is VOC-free, allows for thin layer application without pre-impregnation, and provides improved adhesion and resistance to high temperatures and chemicals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylate coating is applied to the reinforcement, then the coating provides protection against chemical and thermal influences, but the coating decomposes thermally at continuous temperatures of 230°C
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material from acrylate to FKM (fluororubber) dispersion, which has inherently higher thermal stability. This parameter change allows the coating to withstand continuous temperatures of 230°C without decomposing, while maintaining protection against chemical and thermal influences.
Solution Approach 2:
The patent uses a composite coating system consisting of FKM dispersion combined with crosslinking agents (polyamine, monomeric aminosilane, or oligomeric aminosilane). This composite material approach creates a coating that is not only thermally stable but also exhibits improved adhesion and resistance to chemicals, solving the limitation of single-component acrylate coatings.
2Ease of manufacture
If no coating is applied to the reinforcement, then material costs are reduced, but the reinforcement becomes contaminated and produces unclean cutting edges
Solution Approach 1:
The patent employs a water-based FKM dispersion coating that can be applied as a thin layer, providing essential protection against contamination and ensuring clean cutting edges. While not completely eliminating coating material costs, this approach uses a cost-effective water-based formulation rather than expensive solvent-based alternatives, achieving a balance between cost and performance.
3Temperature
If silicone or FKM solution is used for coating, then the coating provides high-temperature resistance, but VOC emissions occur and the solution production is energy-intensive
Solution Approach 1:
The patent converts the traditionally harmful solvent-based FKM solution into a beneficial water-based FKM dispersion system. By replacing organic solvents with water as the dispersion medium, the coating maintains high-temperature resistance while eliminating VOC emissions. The water evaporates without causing environmental harm, turning a potentially harmful process into an environmentally friendly one.
Solution Approach 2:
The patent fundamentally changes the physical-chemical parameters of the coating medium from organic solvent to water-based dispersion. This parameter change eliminates volatile organic compounds while maintaining the protective and high-temperature resistant properties of the FKM coating, addressing both performance and environmental concerns.
4Reliability
If FKM rubber solution is used for coating, then the coating provides chemical resistance, but the solution production requires harmful solvents and is energy-intensive
Solution Approach 1:
The patent transforms the harmful solvent-based FKM solution into a beneficial water-based dispersion system. The water-based FKM dispersion maintains excellent chemical resistance properties while eliminating the need for harmful organic solvents. This conversion benefits both environmental protection and worker health while preserving the desired chemical resistance of the coating.
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 solution results in a cost-effective, VOC-free, high-temperature-resistant transfer hose with improved adhesion and reduced waste, suitable for applications like engine compartments and exhaust systems.
Implementation Method 1
a coating composition containing fluororubber (FKM) is applied to the reinforcement and dried
Implementation Method 2
the dried coating composition is vulcanized on the reinforcement that is arranged over the inner layer to form the FKM coating
Data Source
Figure 1
AI summary
The invention relates to a method for producing an FKM-coated transfer hose, in which an aqueous FKM dispersion, containing at least one crosslinking agent selected from polyamine, monomeric aminosilane and oligomeric aminosilane, is applied to the reinforcing carrier, dried and vulcanized for coating the reinforcing carrier.