Polyphenylene Sulfide Resin Thermal Conductivity
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Solution Overview
Problem
Thermally conductive resin compositions face challenges in achieving high thermal conductivity while maintaining fluidity and mechanical strength, especially in electronic devices where electrical insulation is required, as existing fillers like carbon or graphite are conductive and require high amounts of ceramic fillers that increase viscosity and reduce processability.
Innovation Solution
A polyphenylene sulfide resin composition comprising 30-50% polyphenylene sulfide resin, 1-5% amorphous polyamide resin, and 45-69% thermally conductive insulating fillers such as spherical magnesium oxide or plate-shaped boron nitride, which form an effective thermal conductive network to enhance thermal conductivity, fluidity, and electrical insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermally conductive insulating fillers are used in a large quantity to increase thermal conductivity, then thermal conductivity is improved, but viscosity increases which impairs fluidity and makes injection molding difficult
Solution Approach 1:
The patent changes the particle size parameters of the fillers, using a mixture of fine particles (0.1-10 μm) and coarse particles (10-50 μm). The fine particles fill voids between coarse particles, creating a denser packing structure that forms efficient thermal conduction pathways while maintaining lower viscosity and better fluidity for injection molding.
Solution Approach 2:
The patent creates a composite filler system combining two different particle sizes (fine and coarse particles) with distinct functions. The coarse particles provide the primary thermal conduction framework while the fine particles fill gaps and enhance thermal contact, achieving synergistic thermal conductivity without proportionally increasing viscosity.
2Temperature
If carbon or graphite fillers are used to improve thermal conductivity, then thermal conductivity is improved, but electrical conductivity increases which is unacceptable for electronic devices requiring electrical insulation
Solution Approach 1:
The patent extracts only the thermal conduction function from carbon-based materials by selecting ceramic fillers (alumina, aluminum nitride, boron nitride) that provide thermal conductivity while maintaining electrical insulation. This separates the desired thermal property from the unwanted electrical conductivity property.
Solution Approach 2:
The patent changes the material composition parameter from conductive carbon/graphite to insulating ceramics, specifically selecting ceramic materials with high thermal conductivity and electrical insulation properties suitable for electronic device applications.
3Ease of manufacture
If resin with lower viscosity is used to maintain fluidity during injection molding, then fluidity is improved, but molecular weight decreases which increases reactivity between molecular chains leading to hardening during processing
Solution Approach 1:
The patent introduces a lubricant as an intermediary substance that reduces friction and viscosity during processing, enabling smooth injection molding flow without requiring the base resin to have low molecular weight. The lubricant mediates between the filler-resin interface and processing requirements, maintaining both fluidity and polymer stability.
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 composition achieves excellent thermal conductivity, improved surface appearance, and mechanical properties, including electrical insulation, while maintaining processability and reducing the impact of filler amounts on viscosity, thus addressing the limitations of previous resin compositions.
Implementation Method 1
thermally conductive insulating fillers... form an effective thermal conductive network to enhance thermal conductivity
Implementation Method 2
the viscosity of the resin composition may be reduced by 30% or more compared to a resin composition not including the amorphous polyamide resin
Data Source
AI summary
A polyphenylene sulfide resin composition comprises (A) about 30 to about 50% by weight of a polyphenylene sulfide resin; (B) about 1 to about 5% by weight of an amorphous polyamide resin; and (C) about 45 to about 69% by weight thermally conductive insulating fillers.