TDMAMP Curing Accelerator for Epoxy Insulation Systems
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Solution Overview
Problem
Conventional epoxy resin compositions used in electrical engineering insulation systems face issues with toxicity and volatility due to the use of benzyldimethylamine (BDMA) as a curing accelerator, which requires complex degassing processes and results in insufficient toughness of cured products, while alternatives like 1-methylimidazole have a short pot-life and adverse effects on product properties.
Innovation Solution
The use of 2,4,6-tris(dimethylaminomethyl)phenol (TDMAMP) as a curing accelerator in combination with epoxy resin and anhydride hardener in automatic pressure gelation (APG) or vacuum casting processes, allowing for a less toxic and less volatile alternative that improves the mechanical and electrical properties of the insulation systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BDMA is used as curing accelerator, then the epoxy resin composition achieves good curing performance, but the system exhibits high toxicity and high volatility requiring complex degassing processes
Solution Approach 1:
The patent replaces the toxic and volatile BDMA accelerator with TDMAMP, which has lower toxicity and volatility. This substitution eliminates the need for complex degassing processes while maintaining effective curing acceleration, directly resolving the contradiction between curing performance and harmful factors.
2Object-affected harmful factors
If 1-methylimidazole is used as curing accelerator to reduce toxicity, then the system becomes less toxic, but the pot-life becomes too short for APG or vacuum casting processes
Solution Approach 1:
The patent changes the chemical structure parameters of the accelerator from 1-methylimidazole to TDMAMP. This structural modification adjusts the reactivity parameters, extending the pot-life to be suitable for APG or vacuum casting processes while maintaining low toxicity levels.
3Object-affected harmful factors
If 1-methylimidazole is used as curing accelerator, then the toxicity is reduced, but the cured products exhibit insufficient toughness properties
Solution Approach 1:
The patent substitutes 1-methylimidazole with TDMAMP, which not only reduces toxicity but also improves the mechanical properties of the cured product. The TDMAMP accelerator produces networks with better toughness characteristics, simultaneously resolving both the toxicity and toughness contradictions.
4Ease of manufacture
If BDMA is used and mixed in initial step, then the mixing process is simplified, but the high vapour pressure causes partial discharge during moderate vacuum degassing
Solution Approach 1:
The patent replaces BDMA with TDMAMP, which has lower vapour pressure. This allows the accelerator to be mixed in the initial step with all other components and degassed under moderate vacuum without causing partial discharge, simultaneously achieving process simplification and substance retention.
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 TDMAMP-based compositions provide insulation systems with improved toughness, longer pot-life, and reduced toxicity, enabling the production of articles with enhanced mechanical, electrical, and dielectrical properties, suitable for high-voltage applications without the need for complex degassing processes.
Implementation Method 1
2,4,6-tris(dimethylaminomethyl)phenol (TDMAMP) as a curing accelerator in combination with epoxy resin and anhydride hardener
Implementation Method 2
the epoxy resin composition is injected into the mold from an inlet located at the bottom of the mold by applying pressure to the resin mixing tank
Implementation Method 3
the components are combined and transferred into a mixer and mixed at elevated temperature and reduced pressure to degas the formulation
Implementation Method 4
the temperature of the mold is kept at around 120 C or above to obtain the casting products within a reasonably short time
Data Source
AI summary
A process for the preparation of insulation systems for electrical engineering by automatic pressure gelation (APG) or vacuum casting, wherein a multiple component thermosetting resin composition is used, said resin composition comprising (A) at least one epoxy resin, (B) at least one carboxylic acid anhydride curing agent, and (C) 2,4,6-tris(dimethylaminomethyl)phenol, provides encased articles exhibiting good mechanical, electrical and dielectrical properties which can be used as, for example, insulators, bushings, switchgears and instrument transformers.