Polyamideimide Enamel Wire Coating Adhesivity and Wear Resistance
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Solution Overview
Problem
The existing enamel wire coatings face issues with adhesivity to conducting wires, leading to poor flexibility and wear resistance, and are prone to damage during winding due to increased tension and impact, which affects the reliability and performance of motors in miniaturized and lightweight electric devices.
Innovation Solution
A polyamideimide-based enamel varnish composition is developed, incorporating a first polyamideimide resin and a second polyamideimide resin with a triazine ring having an imidazole group in its side chain, enhancing adhesivity and mechanical properties by forming a robust yet flexible insulated coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamideimide-based resin is used as coating material to increase mechanical strength, then wear resistance is improved, but adhesivity to conductor deteriorates resulting in poor flexibility
Solution Approach 1:
The patent combines polyamideimide resin with polyurethane resin to create a composite coating material. The polyamideimide provides wear resistance and mechanical strength, while the polyurethane component improves adhesivity to the conductor and flexibility. This composite approach allows both requirements to be satisfied simultaneously without compromising either property.
2Productivity
If winding number is increased to achieve miniaturization and lightweightness, then motor performance is improved, but coating layer damage increases due to increased tension and impact
Solution Approach 1:
The patent modifies the chemical composition parameters of the coating material by incorporating polyurethane resin alongside polyamideimide resin. This parameter change enhances the coating's elasticity and adhesivity, allowing it to withstand the increased mechanical stresses from higher winding numbers while maintaining coating integrity and preventing damage during the winding process.
3Strength
If mechanical strength of insulated coating is increased to prevent damage, then coating becomes more rigid, but flexibility deteriorates causing cracking and peeling when bent
Solution Approach 1:
The composite of polyamideimide and polyurethane resins creates a coating with optimized mechanical properties. The polyamideimide contributes rigidity and strength, while the polyurethane adds flexibility and elasticity. This balance prevents cracking and peeling during bending operations while maintaining adequate mechanical strength for wear resistance.
Data Source
AI summary
Disclosed are enamel varnish compositions for an enamel wire and an enamel wire using the same. The present invention relates to enamel varnish compositions for an enamel wire in which a polymeric resin component is included in an organic solvent, wherein the polymeric resin component includes a first polyamideimide resin; and a second resin having polyamideimide in which a triazine ring is introduced into a major chain. The enamel wire, in which such a coating pigment composition is applied to the innermost layer, has the increased adhesivity of the insulated coating layer to the conducting wire, as well as the excellent physical properties such as the wear resistance and flexibility, etc.