Conductive Prepreg Composition for Impact-Resistant CFRP Laminates
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Solution Overview
Problem
Carbon fiber reinforced composite materials face challenges in achieving both excellent impact resistance and conductivity, as existing methods often compromise one property for the other, resulting in reduced conductivity or impact resistance.
Innovation Solution
A prepreg comprising carbon fibers and a thermosetting resin, with the addition of thermoplastic resin particles or fibers and conductive particles or fibers, where the conductive particles or fibers may have a thermoplastic resin nucleus coated with a conductive substance, optimized in weight ratio to enhance both impact resistance and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin layer with dispersed resin particles is provided on the surface region of the prepreg to improve impact resistance, then the toughness and impact resistance are improved, but the conductivity in thickness direction significantly decreases due to the formation of an insulating layer
Solution Approach 1:
The patent applies composite materials by combining thermoplastic resin particles (for toughness) with conductive particles (metal or carbon) in the interlayer. This creates a multi-component composite system where the thermoplastic resin provides impact resistance while the conductive particles maintain electrical conductivity, resolving the contradiction between these two properties in the interlayer structure
Solution Approach 2:
The patent applies local quality by concentrating both thermoplastic resin particles and conductive particles specifically in the interlayer region, while keeping the intralayer regions as conventional carbon fiber/thermosetting resin structures. This localized modification ensures impact resistance and conductivity are enhanced where needed (at layer interfaces) without compromising the overall structural integrity and electrical performance
2Reliability
If metal particles or carbon particles are compounded to the matrix resin to improve conductivity, then the conductivity is improved, but the impact resistance is not adequately addressed and compatibility between the two properties is not achieved
Solution Approach 1:
The patent merges two previously separate functions into a single interlayer composition: the thermoplastic resin particles provide toughness and impact resistance, while the conductive particles simultaneously provide electrical conductivity. This combined approach in the interlayer resolves the contradiction by making both properties work together rather than competing against each other
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 solution enables carbon fiber reinforced composite materials to exhibit high levels of both impact resistance and conductivity simultaneously, improving delamination strength and forming conductive paths within the composite.
Implementation Method 1
the conductivity in thickness direction, among conductivities which are one of characteristics of the carbon fiber reinforced composite material, significantly decreases
Implementation Method 2
an impact resistance expressed by a resistance to drop impact is, since it is determined by delamination strength which is quantitatively measured as interlayer edge peel strength
Data Source
AI summary
A prepreg containing a carbon fiber [A] and a thermosetting resin [B], and in addition, satisfying at least one of the following (1) and (2).(1) a thermoplastic resin particle or fiber [C] and a conductive particle or fiber [D] are contained, and weight ratio expressed by [compounding amount of [C] (parts by weight)]/[compounding amount of [D] (parts by weight)] is 1 to 1000.(2) a conductive particle or fiber of which thermoplastic resin nucleus or core is coated with a conductive substance [E] is contained.