Carbon Fiber Cord Predip Coating for Belt Adhesion
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Solution Overview
Problem
Conventional power transmission belts face challenges in maintaining adhesion between reinforcing cords and rubber compounds under high loads and temperatures, requiring complex and environmentally unfriendly treatment processes.
Innovation Solution
A method involving a water-based polyurethane coating for carbon fiber cords, followed by a resorcinol-formaldehyde-latex (RFL) suspension and a rubber-based overcoat, simplifies the treatment process while enhancing tensile strength, fiber cohesion, and flex fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional three-coating treatment (isocyanate/epoxy primer, RFL treatment, and complex overcoat adhesive) is used, then adhesion between cords and rubber compounds is achieved, but the process becomes expensive, environmentally unfriendly, and complex
Solution Approach 1:
The patent combines the primer treatment and overcoat adhesive functions into a single water-based polyurethane coating that provides both adhesion promotion and rubber compound compatibility. This merging eliminates the need for separate primer and complex overcoat layers, simplifying the process while maintaining adhesion reliability.
Solution Approach 2:
The patent changes the chemical composition parameters of the coating system by using water-based polyurethane instead of organic solvent-based isocyanate/epoxy primers and complex chlorinated polymer blends. This parameter change reduces environmental impact and process complexity while maintaining the required adhesion performance.
2Reliability
If complex multi-component adhesive systems are used, then adhesion under dynamic conditions is achieved, but environmental friendliness deteriorates due to organic solvents and unfriendly components
Solution Approach 1:
The patent changes the chemical parameters by substituting water-based polyurethane for organic solvent-based adhesives containing isocyanates, epoxies, and chlorinated polymers. This parameter change eliminates harmful volatile organic compounds while maintaining the adhesion performance required for dynamic conditions through the polyurethane's inherent bonding properties.
Solution Approach 2:
The patent uses a single-application water-based polyurethane coating that provides sufficient adhesion without requiring multiple layers or complex multi-component systems. This approach eliminates the need for environmentally harmful substances while achieving the required performance through a simpler, more sustainable coating process.
3Reliability
If conventional organic solvent-based primer and overcoat treatments are used, then cord adhesion is achieved, but manufacturing cost increases due to complex processes and optimization requirements
Solution Approach 1:
The patent merges the functions of primer and overcoat into a single water-based polyurethane coating application, eliminating the need for separate treatment steps and reducing manufacturing complexity. This consolidation maintains cord adhesion while simplifying the production process and reducing costs.
Solution Approach 2:
The patent changes the manufacturing parameters by using water-based polyurethane that requires less process optimization compared to conventional organic solvent-based systems. This parameter change reduces manufacturing complexity and cost while maintaining the required adhesion performance through the coating's inherent properties.
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 method improves the tensile strength and durability of power transmission belts by up to 30% and reduces environmental impact through a more straightforward and efficient coating process.
Implementation Method 1
The generation of adhesion between the reinforcing cords and rubber compounds within the neutral plane and adjacent thereto, in dynamic products such as belts, tires, couplings, or hose is fundamental to their proper operation.
Implementation Method 2
a first polyurethane treatment based on hydroxyl- or epoxy-terminated liquid rubber and isocyanate-terminated liquid rubber
Data Source
AI summary
Methods of manufacturing a belt include laying up a first elastomeric layer of a belt build on a mandrel, laying up a tensile reinforcement layer on the first elastomeric layer, where the tensile reinforcement layer contains cords coated with a water based urethane compound, and laying up a second elastomeric layer on the first elastomeric layer and the tensile reinforcement layer. The belt build may be cured in a profile-forming mold, and afterward, cut to a predetermined belt width and/or length.