Epoxy Insulating Resin Impregnation With Low-Waste Thermal Curing
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Solution Overview
Problem
Existing insulating resins and varnishes used in electrical items often rely on organic solvents and energy-intensive processing, posing environmental concerns and inefficiencies.
Innovation Solution
A latent curable, single-component epoxy resin comprising epichlorohydrin and bisphenol F/A, along with a highly reactive encapsulated aliphatic polyamine catalyst, which cures above 80°C, is developed. This resin is used in a system that includes pre-heating, vacuum impregnation, centrifugal removal of excess resin, gelling, and curing, optimizing the impregnation and curing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional insulating resins and varnishes are used with organic solvents, then the electrical and mechanical performance of items is improved, but environmental harm and energy consumption increase
Solution Approach 1:
The patent changes the chemical composition parameters of the resin system by using epoxy resin with polyamine hardener instead of traditional solvent-based resins. This substitution eliminates organic solvents while maintaining the required electrical and mechanical performance, directly resolving the contradiction between reliability and environmental harm
Solution Approach 2:
The patent employs a composite resin system combining epoxy resin, polyamine hardener, and silica microbeads. This composite formulation achieves superior electrical insulation and mechanical strength without requiring organic solvents, thus improving reliability while reducing environmental impact
2Reliability
If traditional energy-intensive processing techniques are used, then the resin impregnation is effective, but energy consumption increases
Solution Approach 1:
The patent modifies the curing parameters by using a polyamine hardener that enables low-temperature curing. The resin system cures effectively at reduced temperatures compared to traditional processes, maintaining impregnation effectiveness while significantly reducing energy consumption
Solution Approach 2:
The patent replaces energy-intensive thermal processing with a chemically-driven curing mechanism. The polyamine hardener initiates exothermic polymerization reactions that cure the resin at lower temperatures, substituting chemical energy for mechanical/thermal energy input
3Reliability
If high resin consumption is used to ensure complete impregnation, then the insulation quality is improved, but material waste increases
Solution Approach 1:
The patent incorporates silica microbeads into the resin system, creating a porous structure that enhances resin penetration and distribution throughout the insulation. This porous composite formulation ensures complete impregnation with reduced resin consumption, improving insulation quality while minimizing material waste
Solution Approach 2:
The epoxy-polyamine-silica composite system achieves superior impregnation efficiency and insulation quality with lower resin consumption. The synergistic combination of materials provides both complete coverage and reduced waste, resolving the contradiction between insulation quality and resin waste
4Reliability
If traditional multi-step processing is used, then the curing is thorough, but production cycle time increases
Solution Approach 1:
The patent combines multiple processing steps into a single integrated curing operation. The polyamine-hardened epoxy system achieves complete curing in one step without requiring separate conditioning or post-treatment steps, maintaining thoroughness while reducing production cycle time
Solution Approach 2:
The patent enables continuous curing through the self-exothermic polymerization reaction of the polyamine-epoxy system. The curing process proceeds continuously without interruption or intermediate steps, ensuring thorough curing while minimizing production time
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 system achieves significant energy savings, reduced cycle time, lower resin consumption, zero waste and emissions, improved production efficiency, and enhanced item quality, while addressing environmental concerns associated with traditional resin applications.
Implementation Method 1
The impregnation process fills voids in the items with a liquid resin or varnish which is transformed into a solid after a chemical and physical reaction known as polymerisation
Implementation Method 2
a first heating chamber for pre-heating the item
Implementation Method 3
a first vacuum pump operatively connected to the impregnation chamber
Implementation Method 4
centrifugal removal of excess resin
Implementation Method 5
a second heating chamber for gelling the resin impregnated item
Implementation Method 6
one or more curing ovens
Implementation Method 7
a cooling chamber where the item is cooled
Data Source
AI summary
A latent curable, single component, epoxy resin with a viscosity at 25° C. of between 50 and 100 poise may include, by weight: i) 60-90% of epichlorohydrin and bisphenol F; ii) 10-40% of epichlorohydrin and bisphenol A; and iii) 2-10% of a reactive catalyst, which is an encapsulated aliphatic polyamine, which cures above 80° C.