Abstract:

Carbon fiber composite materials have advantages such as lightweight and high strength， making them excellent lightweight materials. However， the commonly used carbon fiber composite is based on thermosetting resins such as epoxy resin matrix， facing the challenge of recycling for large-scale application. Thermoplastic carbon fiber composite materials have the advantage of easy recycling， but how to improve the interfacial adhesion of carbon fiber/thermoplastic resins and the efficiency of part forming are the industry challenges. In this paper， taking thermoplastic carbon fiber/nylon 6 composite materials as the research object， for the problem of poor interfacial compatibility of commercialized carbon fiber/nylon 6， a new soluble co-polyamide sizing agent is innovatively designed， which increases the interfacial strength of carbon fiber/nylon 6 by 74.2% and significantly improves the comprehensive performance of carbon fiber/nylon 6. At the same time， the process parameters of prepreg preparation and continuous hot pressing forming are optimized to increase the hot pressing production efficiency of carbon fiber top cover crossbeams to 3.4 min/piece， meeting the requirements of mass production in the automotive industry. Meanwhile， the carbon fiber/nylon 6 top cover crossbeam has extremely high bending strength and modulus， with a weight reduction rate of 68.8% compared to steel parts. In summary， this article provides an innovative solution for mass application of thermoplastic carbon fiber composites （easily recyclable） in automobiles.

Key words: lightweight, carbon fiber, polyamide, interfacial properties, rapid prototyping