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NIMTE made progress on composite materials green recycle technology

News International-French

5 Feb 2013

Through two years efforts, NIMTE have successfully sorted out a low temperature self accelerating recycling process to achieve carbon fiber and epoxy resin (CF/EP) composite materials decomposition and recycling

Thermosetting resin and its composite material have excellent comprehensive properties and performances. It is widely used in aerospace, aviation, industry, civil and other fields. Due to the insoluble three-dimensional reticular cross-linkage structure formed after the thermosetting resin curing does not melt, so that the processing and recycling are very difficult.

In recent years, with the development of China's emerging industries of large aircraft, new energy, and rail transportation, the thermosetting resin matrix composite materials application fields have been constantly expanding, the recycling has increasingly become a prominent problem.

Many research institutions at home and abroad have conducted the research on the relative topics. The reported methods often require strict conditions, and each method has its defects, no one method can be used for all composite material recycling, so new solutions must be found.

In view of this situation, Chinese Academy of Sciences Ningbo Institute of Material Technology and Engineering (NIMTE) polymers and composite materials division from the point of view of environmental protection in 2010, put forward a proposal to carry out research on this issue, and obtained the support of the Director Fund.

Through two years efforts, they have successfully sorted out a low temperature self accelerating recycling process. The method is to achieve carbon fiber / epoxy resin (CF/EP) composite materials efficient decomposition and recycling through two steps in the low toxicity and low corrosion composite solution

Recently, through in-depth research, the new progress has been made in the accelerated decomposition mechanism.

This method is mainly through the reaction of two kinds of components in the reaction system to produce a third kind intermediate. The intermediate decomposed in the reaction conditions the components that can perform fast catalytic reaction, which can realize reaction acceleration.

By controlling the condition, more than 90% of epoxy resin can be decomposed in the reaction temperature 70 ℃ and reaction time of 0.5h, the recovered fiber strength can be maintained at more than 90% of the original fibers.

They have published a paper in the industry publication Green Chem (2012, 14, 3260-3263, IF=6.32) and applied for three patents (ZL 201010274001.7; 201110102003.2; 201110257706.2).

The next step will be to further improve the reaction conditions to control the decomposition products, and to provide the viable solutions for composite materials recycling.

Picture: The mechanism of composite materials self accelerating decomposition

Original language Chinese