使用电解硫酸法的连续碳纤维回收技术

IF 2.3 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Journal of Composite Materials Pub Date : 2024-03-06 DOI:10.1177/00219983241239121
Yuji Okada
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引用次数: 0

摘要

我们的目标是在全社会实施汽车碳纤维循环经济计划。这包括回收从汽车废弃的碳纤维增强塑料/碳纤维增强热塑性塑料(CFRP/CFRTP)中提取的碳纤维,并将其重新整合到汽车制造工艺中。虽然现有的碳纤维回收技术将碳纤维回收为细碎状态,但它并不是原始的连续碳纤维产品。本文阐明了一种新型回收技术,即电解硫酸法(ESAM)。ESAM 利用电解硫酸产生的氧化活性物质,仅将 CFRP/CFRTP 的树脂成分分解为二氧化碳和水,从而回收碳纤维。这种方法可以:(1)适用于所有树脂;(2)保持回收碳纤维的强度;(3)再生连续碳纤维。此外,它也是唯一适用于 CFRP 压力容器的技术。该技术成功实现了压力容器连续碳纤维的回收,从而可以生产新的压力容器和单向 CFRTP 带。该技术回收了原有的连续碳纤维产品,从而实现了 "紧密 "的资源循环周期。我们尚未确认可进行循环的次数。不过,根据本文介绍的方法,回收过程可以在不降低物理特性的情况下生产出连续碳纤维。因此,从理论上讲,只要产品使用过程中的强度降低不是一个重要的考虑因素,就有可能实现无限循环,并将纤维恢复到原始状态。
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Continuous carbon fiber recycling technology using the electrolytic sulfuric acid method
Our objective is to achieve the societal implementation of the Circular Economy Program for Automobile Carbon Fibers. This involves recycling carbon fibers sourced from carbon fiber reinforced plastics/carbon fiber reinforced thermoplastics (CFRP/CFRTP) discarded from automobiles and reintegrating them into the manufacturing processes of automobiles. Although, the existing carbon fiber recycling technology recycles the carbon fiber into a finely chopped state; it is not the original continuous carbon fiber product. A novel recycling technology is elucidated herein, referred to as the electrolytic sulfuric acid method (ESAM). The ESAM recycles carbon fibers by decomposing only the resin component of CFRP/CFRTP into CO2 and water using oxidative active species generated by electrolytic sulfuric acid. This method can (1) be applied to all resins, (2) maintains strength of the recycled carbon fibers, and (3) regenerates continuous carbon fibers. Moreover, it is the only technology applicable to CFRP pressure tanks. The successful recycling of continuous carbon fiber from pressure tanks has been achieved, enabling the production of new tanks and unidirectional CFRTP tape. This technology recycles the original continuous carbon fiber product, thus enabling a “close” resource circulation cycle. We have not yet confirmed the number of times recycling can be performed. However, according to the method described in this paper, the recycling process can yield continuous carbon fibers without a decrease in physical properties. Therefore, theoretically, it becomes possible to recycle indefinitely and revert the fibers to their original state, provided that the strength reduction during product use is not a significant consideration.
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来源期刊
Journal of Composite Materials
Journal of Composite Materials 工程技术-材料科学:复合
CiteScore
5.40
自引率
6.90%
发文量
274
审稿时长
6.8 months
期刊介绍: Consistently ranked in the top 10 of the Thomson Scientific JCR, the Journal of Composite Materials publishes peer reviewed, original research papers from internationally renowned composite materials specialists from industry, universities and research organizations, featuring new advances in materials, processing, design, analysis, testing, performance and applications. This journal is a member of the Committee on Publication Ethics (COPE).
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