研究人员开发了回收CFRP复合材料的优化方法
Mar 9 2021
近年来，人们对循环经济的重点增加了，并且对可回收材料制成的产品的需求增强，但是在开始磨损之前，许多材料只能被回收很多次。亚博网站下载
碳纤维增强聚合物（CFRP）复合材料，不可生物降解的材料就是这种情况，到目前为止，这些材料缺乏可行的回收方法。亚博网站下载
CRFP composites are present in products such as wind turbines, aeroplane parts, vehicles such as cars and ships, and everyday technology such as laptops and mobile phones.
They are typically disposed of in landfills or by incineration, which pose significant threats to both the environment and public health.
绝大多数现有的回收方法也导致回收材料的机械和物理性质大大降低，从而削弱了其核心功能。
Researchers from the University of Sydney's School of Civil Engineering have developed an optimised method for recycling CFRP composites while maintaining 90 percent of their original strength.
“在全球范围内和澳大利亚，已经有一个进军更好的回收过程，但是人们经常相信可以将材料回收的无限次次数 - 完全不是这种情况。大多数回收过程都会减少的机械或物理性能降低亚博网站下载材料，”该研究的主要研究员阿里·哈迪格博士说。
“到目前为止，不可能连续回收由碳纤维制成的产品。鉴于大多数回收涉及切碎，切割或研磨，纤维磨损，降低了未来产品的生存能力，哈迪基博士说。
“This presents a huge challenge and threat to our environment, as it has led to the production of virgin carbon fibre which contributes significantly to greenhouse gas emissions.
“为了解决这个问题并支持真正的循环经济，我们开发了一种有效且具有成本效益的方法来回收碳纤维，该方法存在于片剂中，直至BMWS。”
“To do this we used a two phased, optimised process. The first step is called "pyrolysis", which breaks down a material using heat, but significantly chars the materials which prevents it from developing a good bond with a resin matrix. The second process, oxidation, uses high temperatures to remove this char.
“Pyrolysis and oxidation alone are not enough to preserve carbon fibres and these processes have existed for some time already. To ensure a high quality recovery and economic efficiency, thermal decomposition of CFRPs need to be guided by analysing the energy required to initiate a chemical reaction in the composit, and separate carbon fibres from the surrounding resin matrix.
“What makes our method so successful is that we have added specific parameters - such as temperature, heating rate, atmosphere or time spent being oxidised and heated - that preserve the functionality of carbon fibre."
“We embarked on the project with the aim of producing high grade, low cost structural materials made from recycled carbon fibre composites, for use in industries from aerospace and automotive through to sporting goods and renewable energy and construction."
In 2010, the global production of fibre reinforced polymers (FRP) was approximately 6 million tonnes with a projected growth of 300 percent in the next decade. With this projection, the consumption of FRPs will exceed 18 million tonnes by 2025, with an end-product value of AUD $80 billion.
“The 2016 Australian National Waste Report concludes that the use of composite materials is creating future challenges to recycling. Plainly put, if we do not develop efficient and cost-effective methods to recycle carbon fibre composites, we risk damaging the environment significantly,"said Dr Hadigheh.
美国，日本和中国以碳纤维制造业领导着世界。研究人员希望提高澳大利亚工业的能力，并与风力涡轮机和商用飞机的制造商以及体育用品的生产商以及建筑，汽车和造船行业合作。
Source:https://www.sydney.edu.au/
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