A kind of high-performance carbon nanotube/carbon composite fiber and its rapid preparation method
A carbon nanotube composite and carbon nanotube fiber technology, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of time-consuming, energy consumption, and electrical performance degradation, so as to reduce the cross-sectional area, overcome agglomeration, improve The effect of the force between the tubes
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[0038] One aspect of the embodiments of the present invention provides a rapid preparation method of high-performance carbon nanotubes / carbon composite fibers, comprising:
[0039] During and / or after the spinning of carbon nanotube fibers, fully infiltrate and twist the carbon nanotube fibers with a precursor solution of a polymer with a high carbon content, and then remove the solvent on the surface of the carbon nanotube fibers;
[0040] And, applying a drawing force to the obtained carbon nanotube composite fiber, and simultaneously passing an electric current into the carbon nanotube composite fiber, so that the precursor of the polymer with high carbon residue rate in the carbon nanotube composite fiber is crossed. Co-curing, followed by carbonization of the formed polymer, produces high-performance carbon nanotube / carbon composite fibers.
[0041] In some typical implementation cases, the preparation method specifically includes:
[0042] (1) In an air atmosphere, a dr...
Embodiment 1
[0087]The carbon nanotube fibers are prepared by floating chemical vapor deposition method. The specific process is as follows: using ethanol as the carbon source, ferrocene as the catalyst, and thiophene as the growth aid, using a syringe pump to slowly and uniformly remove the carbon source, catalyst and growth aid. The formed mixed solution is injected into the reaction zone, and the formed continuous carbon nanotube aerogel is shrunk through a sealed water tank to obtain flat carbon nanotubes. During the preparation process, a certain amount of high-purity hydrogen is also introduced, and the flow rate is 60-80 sccm. The injection speed of the mixed solution was controlled at 6-8 μL / min. The reaction zone adopts alumina corundum tube, the carbon nanotube growth temperature in the furnace is set to 1300°C, and the length of the high temperature reaction zone is >40cm. In order to protect the whole reaction, high-purity argon (99.99%) was used as the carrier gas, and the fl...
Embodiment 2
[0092] Growth of carbon nanotube aerogels by floating CVD method, that is, under the carrier flow of argon and hydrogen, a mixture of ethanol, ferrocene and thiophene is injected into a high temperature tube furnace at 1300 °C at a rate of 6-8 μL / min , the carrier gas flow rate is 80-120sccm, and continuous carbon nanotube aerogel is formed at the other end of the high-temperature tube furnace.
[0093] After the carbon nanotube flat filament comes out of the furnace, it is passed through the PAN / DMF solution with a mass fraction of 3 wt%, and then the infiltrated carbon nanotube flat filament is drawn and twisted at the same time to obtain CNT / PAN composite fiber, and then CNT / PAN The composite fibers were passed through a heating furnace to remove the solvent from the fibers, and the temperature was set at 50°C. Let the dried CNT / PAN composite fiber pass through a quartz tube that allows the gas to circulate freely. After the fiber passes through the quartz tube, it is conne...
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