Multilayer Thermoplastic Coating for Power Transmission Belt Friction Control
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Solution Overview
Problem
Existing power transmission belts experience an abrupt increase in friction due to polyurethane penetrating the textile overlay, leading to reduced durability and service life, as existing solutions either hinder mechanical intermeshing or provide temporary abrasion control that fails to maintain performance characteristics.
Innovation Solution
A multilayered textile finish with a first thermoplastic coating that penetrates into the textile overlay and a second thermoplastic coating with a higher melting point, forming a barrier to prevent polyurethane penetration and maintaining a low coefficient of friction, combined with reinforcement to enhance mechanical intermeshing and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane is cast directly onto the textile overlay, then the polyurethane reacts, crosslinks and solidifies on the overlay, but the polyurethane penetrates into the textile and causes increased friction when the textile wears away
Solution Approach 1:
The coating is divided into two distinct layers: a first thermoplastic coating that penetrates into the textile overlay to provide mechanical intermeshing and adhesion, and a second thermoplastic coating with higher melting point that forms a barrier layer to prevent polyurethane penetration and maintain low friction. This segmentation allows each layer to perform its specific function without compromising the other.
Solution Approach 2:
The first thermoplastic coating acts as an intermediary between the textile overlay and the polyurethane, providing mechanical intermeshing and adhesion promotion. The second thermoplastic coating with higher melting point serves as a mediator that prevents direct contact between polyurethane and the textile, thereby maintaining low friction characteristics throughout service life.
2Object-affected harmful factors
If PTFE is used to render the textile lubricious, then friction is reduced, but the PTFE breaks and is lost during use
Solution Approach 1:
The invention uses composite thermoplastic materials in the two-layer coating system. These composite materials provide both the lubricious properties needed for low friction and the durability required to prevent breaking and loss during use. The thermoplastic coatings are applied in a controlled manner to ensure proper adhesion and resistance to mechanical failure.
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 effectively extends the service life of the belt by preventing polyurethane penetration and maintaining low friction, ensuring consistent performance by retaining polyurethane within the impregnated zone and allowing the second coating to wear away, revealing an abrasion-resistant textile with reduced friction.
Implementation Method 1
the first coating of a first thermoplastic material on the exteriorally lying surface of the textile overlay, the first coating having at least partially penetrated into the textile to form an impregnation therein
Implementation Method 2
the first coating having at least partially penetrated into the textile to form an impregnation therein
Implementation Method 3
a second coating of a second thermoplastic material is present on the first coating... forming a barrier to prevent polyurethane penetration
Implementation Method 4
the melting temperature of the second thermoplastic material is higher than that of the first thermoplastic material... while the first thermoplastic material has a melting temperature of from 80° C. to about 145° C.
Data Source
AI summary
A power transmission belt having a base made of polyurethane and a textile overlay includes a first coating of a first thermoplastic material on the surface of the textile overlay. The first coating forms an impregnation, which has a melting temperature from 80° C. to approximately 145° C., penetrates at least partially into the textile. A second thermoplastic material on the first coating has a higher melting point. The first and second coatings can be applied successively to the textile overlay before casting of the polyurethane or can be overlaid as individual films or as a multi-layer film, and they may be applied to the textile overlay by heat and pressure. The coating acts to reduce abrasion and prevents the through passage of the belt polyurethane.