Thermoplastic Arc Chamber Base for Recyclable MCCB Switching
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Solution Overview
Problem
Molded case circuit breakers (MCCBs) using thermosetting unsaturated polyester resin face issues with physical property variations due to sensitivity to temperature and humidity, long curing times, increased production costs, and environmental unsustainability, along with challenges in uniformly dispersing glass fibers and recycling.
Innovation Solution
An arc extinguishing chamber base made from an aromatic polyamide-based (polyphthalamide) thermoplastic resin, comprising 30-100 mol% aromatic dicarboxylic acid, aliphatic or cycloaliphatic diamine, with inorganic fillers, heat stabilizers, antioxidants, and ceramic or glass ball particles, which improves mechanical properties and allows for recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermosetting unsaturated polyester resin is used for the arc extinguishing chamber base, then the material provides excellent electrical, mechanical, and thermal properties, but it causes physical property variations due to sensitivity to temperature and humidity, and has long curing times
Solution Approach 1:
The patent changes the fundamental chemical parameter of the resin system from thermosetting unsaturated polyester resin to thermoplastic polyphthalamide resin. This parameter change transforms the material from requiring a long curing process to one that can be processed by conventional thermoplastic molding methods, thereby resolving the productivity contradiction while maintaining reliable electrical, mechanical, and thermal properties.
Solution Approach 2:
The patent uses a composite material system consisting of polyphthalamide resin combined with glass fibers and mineral fillers. This composite approach maintains the excellent mechanical and electrical properties of the original thermosetting material while achieving the processing advantages of thermoplastic materials, including shorter cycle times and no post-curing requirements.
2Stability of the object's composition
If thermosetting unsaturated polyester resin is used for the arc extinguishing chamber base, then the material provides good dimensional stability, but it causes physical property variations depending on storage period and is sensitive to temperature and humidity
Solution Approach 1:
The patent changes the material state parameter from thermosetting to thermoplastic, eliminating the curing process that causes physical property variations during storage. The thermoplastic polyphthalamide resin maintains dimensional stability through its inherent molecular structure while avoiding the progressive curing that affects thermosetting materials, thereby ensuring consistent physical properties regardless of storage duration or environmental conditions.
3Strength
If BMC or SMC materials are used for manufacturing, then the materials provide reinforced structure with glass fibers, but it is difficult to uniformly disperse glass fibers during the kneading process, causing variations in thickness
Solution Approach 1:
The patent replaces the mechanical kneading process with a molding process suitable for thermoplastic materials. Instead of requiring intensive mixing and kneading to disperse glass fibers, the thermoplastic polyphthalamide resin with glass fiber reinforcement can be processed through conventional injection molding or compression molding, where the material melts and flows uniformly, automatically achieving homogeneous fiber distribution and consistent thickness without the defects associated with mechanical mixing of thermosetting composites.
4Reliability
If thermosetting unsaturated polyester resin is used, then the material provides good arc resistance, but it is not environmentally sustainable and cannot be recycled
Solution Approach 1:
The patent changes the recyclability parameter of the material system from non-recyclable thermosetting resin to recyclable thermoplastic resin. The polyphthalamide resin maintains the necessary arc resistance and electrical insulation properties while being fully recyclable through conventional thermoplastic processing methods, thereby eliminating the environmental harm associated with disposable thermosetting composite materials.
Data Source
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AI summary
The present invention relates to an arc extinguishing chamber base of a molded case circuit breaker and, more specifically, to an arc extinguishing chamber base of a molded case circuit breaker, manufactured using a thermoplastic resin. The present invention enables an arc extinguishing chamber base for forming a molded case circuit breaker to be manufactured using an aromatic polyamide-based thermoplastic resin, thereby enabling an increase in productivity, a decrease in component weight, a reduction in component production time, an eco-friendly effect, and recycling. Furthermore, component lifespan increases.