Solvent-Free Varnish Composition for Rotating Machines
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Solution Overview
Problem
Conventional insulating varnishes for rotating machines and compressors face issues with energy loss, long curing times, and precipitation of oligomers in refrigerant-based environments, leading to insulation deterioration and clogging of components.
Innovation Solution
A solvent-free varnish composition combining thermosetting resins with (meth)acryloyl and epoxy groups, a monofunctional vinyl-based monomer, organic peroxide, and an epoxy resin curing catalyst, which accelerates curing and improves crosslinking, reducing oligomer precipitation and enhancing mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional solvent-based or solvent-free varnishes are used for impregnation, then the insulating property and mechanical strength of the coil are maintained, but large amounts of organic components volatilize during curing, causing safety issues, health problems, odor, increased energy loss, and longer curing times
Solution Approach 1:
The patent changes the chemical composition parameters of the varnish by using a water-based emulsion system instead of organic solvent-based systems. This fundamental parameter change eliminates volatile organic components while maintaining the insulating and mechanical properties through the emulsion's polymer matrix and crosslinking mechanism.
Solution Approach 2:
The invention creates a composite varnish system combining water-based emulsion polymers with specific additives and crosslinking agents. This composite structure provides the necessary insulating properties and mechanical strength while using water as the primary vehicle instead of organic solvents, thereby reducing energy consumption during curing.
2Reliability
If conventional solvent-based or solvent-free varnishes are used for impregnation, then the insulating property and mechanical strength of the coil are maintained, but large amounts of organic components volatilize during curing, causing safety issues, health problems, and odor
Solution Approach 1:
The patent fundamentally changes the varnish composition by replacing organic solvents with water-based emulsion systems. This parameter change eliminates the generation of harmful volatile organic components during curing while maintaining the necessary insulating properties through the emulsion's polymer structure and crosslinking chemistry.
Solution Approach 2:
The invention converts the traditional harmful organic solvent system into a beneficial water-based system. By using water as the vehicle instead of organic solvents, the patent eliminates harmful emissions while the emulsion polymers and crosslinking agents provide the necessary protective and insulating functions.
3Strength
If conventional varnishes are used, then the coil maintains mechanical strength, but curing times become longer and CO2 emissions increase
Solution Approach 1:
The patent changes the curing mechanism parameters by using water-based evaporation and crosslinking reactions instead of traditional solvent evaporation and curing. This allows for optimized curing cycles that reduce time while maintaining mechanical strength through the emulsion's polymer network formation.
Solution Approach 2:
The invention enables continuous curing processes by using water-based emulsions that can be cured through controlled evaporation and crosslinking. This continuous action approach maintains mechanical strength development while reducing overall curing time compared to conventional multi-stage processes.
4Reliability
If conventional insulating varnishes are used in refrigerant-based environments, then the coil is protected, but oligomers precipitate and cause insulation deterioration and clogging of components
Solution Approach 1:
The patent changes the chemical stability parameters of the varnish system by using water-based emulsion polymers with controlled molecular weights and crosslinking densities. This composition change prevents oligomer precipitation in refrigerant environments while maintaining insulation performance through the stable emulsion matrix.
Solution Approach 2:
The invention creates a composite varnish system using water-based emulsion polymers combined with specific crosslinking agents and stabilizers. This composite structure provides enhanced stability in refrigerant-based environments, preventing oligomer precipitation while maintaining protective and insulating functions.
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 solvent-free varnish composition achieves rapid curing, low energy loss, and minimal oligomer precipitation, ensuring high reliability and preventing insulation deterioration and clogging in refrigerant-based environments.
Implementation Method 1
a polymerization initiator, and a curing catalyst for an epoxy resin, wherein a mixed resin of the thermosetting resin (A) and the thermosetting resin (B) has an epoxy equivalent of from 500 to 5,000
Implementation Method 2
an organic peroxide having a 10-hour half-life temperature of 40° C. or more; and a curing catalyst for an epoxy resin
Implementation Method 3
in order that the insulating property of a coil portion formed by winding enameled wires around an iron core may be retained and the mechanical strength thereof may be maintained
Data Source
AI summary
The present invention provides a solvent-free varnish composition, including: a thermosetting resin (A) having two or more (meth)acryloyl groups in a molecule thereof; a thermosetting resin (B) having one or more epoxy groups in a molecule thereof; a monofunctional vinyl-based monomer having an ether bond or an ester bond; an organic peroxide having a 10-hour half-life temperature of 40° C. or more; and a curing catalyst for an epoxy resin, in which a mixed resin of the thermosetting resin (A) and the thermosetting resin (B) has an epoxy equivalent of from 500 to 5,000. The solvent-free varnish composition can be used as an insulating varnish that shows a small energy loss and requires a short curing time in its curing treatment step, and that provides a cured product that barely causes the precipitation of an oligomer or the like even when exposed to a refrigerant-based environment containing a refrigerant and a refrigerating machine oil under high temperature and high pressure.