Prepreg Conductive Particle Distribution for Composite Impact and Conductivity
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Solution Overview
Problem
Conventional carbon fiber-reinforced composite materials face challenges in achieving both high impact resistance and conductivity, particularly in the lamination direction, due to the insulative resin layers formed between layers, which hinder conductivity.
Innovation Solution
A prepreg design incorporating carbon fibers impregnated with a matrix resin containing thermosetting resin, curing agent, conductive particles of varying diameters, and thermoplastic resin particles, where larger conductive particles are disproportionately distributed in the surface layers and smaller particles within the carbon fiber layers, enhancing conductivity and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If resin fine particles are dispersed in the surface portion to improve impact resistance, then impact resistance is improved, but conductivity in the lamination direction becomes very poor due to insulative resin layer formation
Solution Approach 1:
The patent applies local quality by differentiating the distribution of conductive particles based on spatial location within the prepreg. Larger conductive particles (5 μm or larger) are concentrated in the surface layers to maintain insulation and impact resistance, while smaller conductive particles (1 μm or smaller) are placed in the interior regions to ensure conductivity. This spatial differentiation resolves the contradiction by allowing different regions to fulfill different functions.
Solution Approach 2:
The patent segments the conductive particles into two distinct size categories (1 μm or smaller and 5 μm or larger) and distributes them to different locations within the prepreg structure. This segmentation allows the surface portion to maintain insulative properties for impact resistance while the interior provides conductivity pathways, thus resolving the contradiction between these two opposing requirements.
2Reliability
If conductive particles are incorporated in matrix resin to improve interlayer conductivity, then conductivity is improved, but impact resistance deteriorates due to insulative resin layer formation
Solution Approach 1:
The patent applies local quality by differentiating the distribution of conductive particles based on spatial location within the prepreg. Larger conductive particles (5 μm or larger) are concentrated in the surface layers to maintain insulation and impact resistance, while smaller conductive particles (1 μm or smaller) are placed in the interior regions to ensure conductivity. This spatial differentiation resolves the contradiction by allowing different regions to fulfill different functions.
Solution Approach 2:
The patent changes the particle size parameter to differentiate functional requirements. By using two distinct size ranges (1 μm or smaller for conductivity and 5 μm or larger for impact resistance), the patent allows the same conductive particle system to simultaneously provide both conductivity and impact resistance, resolving the contradiction through parameter differentiation.
3Strength
If thermosetting resin is used as matrix resin to achieve high strength, then strength is improved, but toughness deteriorates making the material easily broken under off-axis stress
Solution Approach 1:
The patent uses composite materials by combining thermosetting resin with thermoplastic resin particles in the matrix system. The thermosetting resin provides high strength and stiffness, while the thermoplastic resin particles provide toughness and impact resistance. This composite approach allows the material to simultaneously achieve both strength and toughness, resolving the contradiction between these opposing properties.
Solution Approach 2:
The patent changes the resin type parameter from pure thermosetting to a composite of thermosetting and thermoplastic resins. This parameter change allows the matrix resin to exhibit both the high strength characteristics of thermosetting resins and the toughness characteristics of thermoplastic resins, resolving the contradiction between strength and toughness.
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 approach results in a carbon fiber-reinforced composite material with improved impact resistance and conductivity in the lamination direction, effectively addressing the limitations of previous technologies by creating a synergistic effect between conductive particles and thermoplastic resin particles.
Implementation Method 1
The conductive particles include conductive particles of 1 μm or smaller in diameter and conductive particles of 5 μm or larger in diameter. In the thickness direction of the prepreg, the conductive particles of 5 μm or larger in diameter are disproportionately distributed in either or both surface layers of the prepreg and the conductive particles of 1 μm or smaller in diameter are disproportionately distributed interior to the carbon fibers
Implementation Method 2
a prepreg in which resin fine particles are dispersed in the surface portion has been proposed. For example, there is proposed a technology for providing a high-toughness composite material having good heat resistance with the use of a prepreg in which resin fine particles composed of a thermoplastic resin such as nylon are dispersed in the surface
Implementation Method 3
a sheet-form prepreg comprising a plurality of carbon fibers and a matrix resin with which the plurality of carbon fibers are impregnated
Data Source
AI summary
The present invention relates to a sheet-form prepreg which comprises a plurality of carbon fibers and a matrix resin with which the plurality of carbon fibers are impregnated. This matrix resin contains a thermosetting resin, a curing agent, conductive particles of 1 μm or smaller in diameter, conductive particles of 5 μm or larger in diameter and thermoplastic resin particles, and the conductive particles of 1 μm or smaller in diameter, the conductive particles of 5 μm or larger in diameter and the thermoplastic resin particles are each disproportionately distributed in a specific part of the prepreg.By the present invention, a prepreg from which a carbon fiber-reinforced composite material having both excellent impact resistance and good conductivity in the lamination direction can be produced is provided.