Composite material and method for manufacturing the same

The composite material, comprising a polymer with nitrile groups and boron nitride particles, addresses the mechanical strength limitations of existing thermally conductive composites by enhancing both thermal conductivity and mechanical properties under thermal stress.

JP2025047866APending Publication Date: 2025-04-03KK TOYOTA CHUO KENKYUSHO
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Patent Information

Application Number
JP2023156620
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-22
Publication Date
2025-04-03

AI Technical Summary

Technical Problem

Existing thermally conductive composite materials lack adequate mechanical strength, particularly under thermal stress, despite achieving low costs and high thermal conductivity.

Method used

A composite material is developed using a polymer with nitrile groups and boron nitride particles, which exhibit excellent affinity and adhesion, enhancing both thermal conductivity and mechanical strength.

Benefits of technology

The composite material achieves high thermal conductivity and improved mechanical strength, including resistance to thermal stress, while maintaining a low cost structure.

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Abstract

To provide a heat-conductive composite material which is excellent in mechanical strength.SOLUTION: A composite material contains a resin and heat-conductive particles. The resin contains a polymer having a nitrile group. The heat-conductive particles contain particles composed of boron nitride (BN). The nitrile group has an affinity to the BN, and it is considered that mechanical strength of the composite material is improved by improvement of adhesion between the polymer and the BN particles. Preferably, the polymer has a ratio (n / T) of the number (n) of constitutional units having a nitrile group (-CN) to the total number (T) of the constitutional units of 0.02 to 0.12. Furthermore, preferably, the resin has granular island-like parts, and the heat-conductive particles are unevenly distributed between the island-like parts. Thereby, a composite material having high heat-conductivity is obtained while suppressing the amount of heat-conductive particles.SELECTED DRAWING: None
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