Self-Assembled Carbon Fiber Bundle, Method for Producing Same, Prepreg and Method Producing Same
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Solution Overview
Problem
Current methods lack an efficient technique for producing short carbon fiber bundles from continuous carbon fiber bundles for use as reinforcements in FRP and thermosetting prepregs, particularly from recycled CFRP scraps or prepreg offcuts, with existing techniques either being inefficient or requiring significant processing.
Innovation Solution
A self-assembled carbon fiber bundle (SACFB) is formed by aggregating short carbon fibers with an organic binder, where the fibers are spontaneously bundled and impregnated with a thermosetting resin composition, allowing for the creation of prepregs with specific fiber length and bundle size characteristics suitable for reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If continuous carbon fiber bundles are cut into short carbon fiber bundles for use as reinforcement in FRP, then the bundle size becomes suitable for specific applications (e.g., 6K or less), but the production efficiency decreases and additional processing steps are required
Solution Approach 1:
The patent utilizes the self-assembly phenomenon where short carbon fibers spontaneously bundle themselves into needle-like structures through capillary action when a small amount of chloroform is added to water containing dispersed carbon fibers. This self-bundling process eliminates the need for complex mechanical bundling equipment and manual operations, achieving both precise bundle size control and high production efficiency simultaneously
2Productivity
If carbon fibers are mechanically bundled to maintain large bundle sizes (e.g., 48K), then production efficiency is high, but the bundle size is too large for applications requiring small bundles (e.g., 6K or less)
Solution Approach 1:
The patent changes the physical and chemical parameters of the carbon fiber system by dispersing carbon fibers in a specific liquid medium (water with chloroform) and controlling the evaporation process. This parameter change causes the fibers to self-assemble into bundles of desired size, transforming the approach from mechanical bundling to chemical-physical self-organization, thereby achieving precise bundle size control without sacrificing production efficiency
3Ease of repair
If recycled carbon fibers from waste materials are used as raw materials, then resource utilization improves, but the fibers require bundling to restore their high-performance characteristics
Solution Approach 1:
The patent applies self-assembly to recycled carbon fibers, where the fibers automatically bundle themselves into organized structures through capillary action in the chloroform-water system. This self-bundling capability restores the high-performance characteristics of recycled fibers without requiring complex external bundling equipment or processes, making recycling both environmentally beneficial and technically straightforward
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 SACFB method enables the production of prepregs with enhanced reinforcing effects, improved resin impregnation, and efficient use of recycled carbon fibers, offering a cost-effective and high-quality solution for CFRP products.
Implementation Method 1
A phenomenon has been reported that by adding a small amount of chloroform to water in which short carbon fibers having a length of 3 to 5 mm are dispersed and shaking vigorously, the short carbon fibers agglomerate and form needle-like bundles by self-assembly.
Data Source
AI summary
A prepreg including a thermosetting resin composition and a self-assembled carbon fiber bundle impregnated with the thermosetting resin composition.