PBT Resin Composition Enhancing Tracking Resistance
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Solution Overview
Problem
Polybutylene terephthalate (PBT) resin compositions with glass fiber reinforcement often experience a deterioration in tracking resistance, which is critical for safety in electrical and electronic components, particularly when used near power sources.
Innovation Solution
A PBT resin composition incorporating 10-20% glass fiber, an ethylene/ethyl acrylate copolymer, and an epoxy compound with an epoxy equivalent weight of 600 to 1,500 g/equivalent, enhancing the comparative tracking index (CTI) to 600 V or higher, as measured by the IEC 60112 standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass fiber is added to PBT resin to improve mechanical strength, then mechanical properties are enhanced, but tracking resistance deteriorates significantly
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that mediates between the glass fiber and PBT resin matrix. This coupling agent contains both inorganic binding groups that bond with glass fiber and organic binding groups that bond with the resin, creating a bridging layer that prevents direct harmful interaction between glass fiber and the resin matrix, thereby maintaining tracking resistance while preserving mechanical reinforcement
Solution Approach 2:
The patent modifies the surface parameters of glass fiber through silane treatment, changing its chemical composition and surface properties. This parameter change transforms the glass fiber surface from a tracking-resistance-deteriorating state to a state that is compatible with the PBT resin matrix, allowing high glass fiber content (10-20%) to be incorporated without significant loss of tracking resistance
2Strength
If high amount of glass fiber (10-20% by mass) is incorporated to achieve reinforcement, then mechanical properties improve, but CTI value decreases
Solution Approach 1:
The silane coupling agent serves as a protective intermediary that allows high glass fiber content to be incorporated into the PBT resin without causing significant deterioration of tracking resistance. The coupling agent creates a barrier layer around glass fibers, preventing them from acting as tracking sites, thus enabling the use of 10-20% glass fiber while maintaining CTI values above 600V
Solution Approach 2:
The patent creates a composite material system consisting of PBT resin, glass fiber, and silane coupling agent. This composite structure combines the mechanical reinforcement benefits of glass fiber with the tracking resistance properties of PBT resin, where the silane coupling agent ensures compatible interaction between components, achieving both high strength and high CTI (>600V) simultaneously
Data Source
AI summary
A polybutylene terephthalate resin composition containing a polybutylene terephthalate resin, 10 to 20% by mass of glass fiber relative to a total mass of the composition, an ethylene/ethyl acrylate copolymer, and an epoxy compound having an epoxy equivalent weight of 600 to 1,500 g/equivalent, and having a comparative tracking index (CTI) of 600 V or higher, measured in accordance with the third edition of IEC 60112.