Impregnating Resin Nanoparticle Dispersion Polymerization Control
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Solution Overview
Problem
Existing impregnating resins for electrical insulation bodies have a shortened life due to the presence of nanosize particles, which accelerate the polymerization of the synthetic resin, making impregnation difficult and reducing the partial discharge resistance.
Innovation Solution
Incorporating a free-radically polymerizing reactive diluent with a lower viscosity into the impregnating resin, allowing for a higher proportion of nanosize particles while reducing the base resin concentration, thereby slowing down polymerization and increasing the resin's life, along with the use of a crosslinker and a second filler to enhance strength and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanosize particles are dispersed in the synthetic resin to improve partial discharge resistance, then the partial discharge resistance is improved, but the polymerization rate increases and the resin life is shortened
Solution Approach 1:
A retarder is introduced as an intermediary substance that mediates between the nanosize particles and the base resin. The retarder selectively interacts with the base resin to inhibit its polymerization rate without affecting the nanosize particles, thereby extending resin life while maintaining partial discharge resistance improvement
Solution Approach 2:
The polymerization rate parameter of the base resin is changed by adding a retarder. This parameter modification allows the resin to maintain lower viscosity for longer periods, extending the usable life of the impregnating resin while still achieving the desired partial discharge resistance through nanosize particle incorporation
2Strength
If the concentration of base resin is increased to maintain strength, then the strength is improved, but the polymerization rate increases and viscosity increases making impregnation difficult
Solution Approach 1:
The retarder acts as an intermediary that decouples the relationship between base resin concentration and polymerization rate. This allows maintaining higher base resin concentrations for strength without the proportional increase in polymerization rate and viscosity that would otherwise make impregnation difficult
Solution Approach 2:
The retarder is added preliminarily to the impregnating resin formulation before the impregnation process. This preliminary action of inhibiting polymerization ensures that the resin maintains appropriate viscosity characteristics throughout the impregnation process, even with higher base resin content
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 enables the production of electrical insulation bodies with a longer life and higher thermal conductivity, as the reactive diluent reduces the polymerization rate of the base resin, allowing for a higher mass proportion of nanosize particles, thus improving the insulation's durability and performance.
Implementation Method 1
The reactive diluent has a lower viscosity than the base resin, as a result of which it is possible to achieve a higher proportion by mass of the nanosize particles in the impregnating resin
Implementation Method 2
a free-radically polymerizing reactive diluent... the presence of the reactive diluent reduces the concentration of the base resin in the impregnating resin, as a result of which the polymerization rate of the base resin is reduced
Implementation Method 3
To improve the partial discharge resistance of the main insulation, the use of nanosize particles which are dispersed in the synthetic resin before impregnation is known
Data Source
AI summary
An impregnating resin for an electrical insulation body includes a base resin, a filler having nanoscale particles, and a radically polymerizing reactive diluent. The impregnating resin includes a crosslinker for crosslinking the base resin and the reactive diluents. The base resin is an epoxy resin. An electrical insulation body includes the impregnating resin and a method produces the electrical insulation body by production of an impregnating resin having a base resin, a filler having nanosize particles and a free-radically polymerizing reactive diluent.