Carbon Fiber Prepreg Composition for Impact Resistance and Conductivity
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Solution Overview
Problem
Carbon fiber reinforced composite materials face challenges in achieving both high impact resistance and conductivity, as existing methods either enhance impact resistance at the cost of conductivity or vice versa, and compatibility between these properties has not been effectively addressed.
Innovation Solution
A prepreg composition is developed using a combination of thermoplastic resin particles and conductive particles, where the thermoplastic resin particles improve impact resistance and the conductive particles, either in their pure form or coated with a conductive substance, enhance conductivity, maintaining a high carbon fiber content and optimizing the weight ratio for both properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin layer with dispersed thermoplastic 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 (carbon or metal) in the interlayer resin. This creates a multi-component composite where the thermoplastic resin provides impact resistance while the conductive particles maintain electrical conductivity, resolving the contradiction between these two properties in the interlayer region
Solution Approach 2:
The patent applies local quality by differentiating the composition of the surface resin layer from the interlayer resin. The surface layer contains primarily thermoplastic resin particles for impact resistance, while the interlayer resin specifically contains conductive particles to ensure conductivity. This localized differentiation allows each region to optimize its properties without compromising the other
2Reliability
If conductive particles are added to improve conductivity of the interlayer, then the conductivity is improved, but the impact resistance deteriorates due to lack of toughness enhancement
Solution Approach 1:
The patent merges the functions of thermoplastic resin particles and conductive particles in the interlayer resin composition. Both types of particles are combined in specific weight ratios (thermoplastic resin 1-50 parts by weight, conductive particles 1-49 parts by weight) to simultaneously achieve toughness improvement for impact resistance and conductivity enhancement, resolving the contradiction between these properties
3Strength
If the content of thermoplastic resin particles is increased to improve impact resistance, then the toughness is improved, but the carbon fiber content decreases and conductivity deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the weight ratio of thermoplastic resin particles to total particles (5-80 wt%, preferably 10-70 wt%) and conductive particles to total particles (20-90 wt%, preferably 30-80 wt%). These optimized parameter ranges ensure sufficient thermoplastic resin content for impact resistance while maintaining adequate conductive particle content and carbon fiber proportion for conductivity, resolving the contradiction between these properties
Data Source
Figure 1~2
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.