Back to results
US 9,790,346 B2Granted
Methods for recovering carbon fiber from carbon-fiber-reinforced polymer (CFRP) composites
AssigneeEast China University of Science and Technology
InventorsChongjun Zhao, Muzi Shitian, Weifeng Ma, Xiuzhen Qian, Jinchao Zhang, Xin Chen
Life of this patent
Estimating the term…
Abstract
Method for recovering carbon fibers from carbon fiber reinforced polymer composites is provided. The recovered carbon fibers can be separable and can be substantially free of thermosetting resins. Compositions comprising said recovered carbon fibers are also provided.
Claims22
A method of recovering carbon fibers from fiber-reinforced composite, the method comprising:
- providing the fiber-reinforced composite comprising the carbon fibers and a thermosetting resin;
- contacting the fiber-reinforced composite with a first organic solvent including an alcohol to form carbon fiber bundles from the fiber-reinforced composite;
- after contacting the fiber-reinforced composite with the first organic solvent, contacting the carbon fiber bundles with an acid solution to form acid-treated carbon fibers;
- and
- contacting the acid-treated carbon fibers with a second organic solvent.
2 more elements
A method of recovering carbon fibers from fiber-reinforced composite, the method comprising:
- providing the fiber-reinforced composite comprising the carbon fibers and a thermosetting resin;
- contacting the fiber-reinforced composite with a first organic solvent to form carbon fiber bundles from the fiber-reinforced composite;
- combining the carbon fiber bundles with a second organic solvent to form a mixture;
- heating the mixture under solvothermal conditions;
- and
- isolating the carbon fibers from the mixture.
3 more elements
A composition comprising:
- a non-acidic organic solvent solution, wherein the non-acidic organic solvent comprises one or more of chloroform, dichloromethane, tetrahydrofuran, meta-xylene, N,N-dimethylformamide, carbon tetrachloride, benzene, or toluene;
- recycled carbon fibers dispersed in the non-acidic organic solvent;
- and
- a thermosetting resin at least partially dissolved in the non-acidic organic solvent.
1 more element
Dependencies are inferred from the claim text.