High-performance carbon nano tube yarn and preparation method thereof

Abstract

The invention discloses a high-performance carbon nano tube yarn and a preparation method thereof. The preparation method includes introducing at least two carbon nano tube fibers into a through hole,and pulling the carbon nano tube fibers along the length direction to thread the through hole with the carbon nano tube fibers continuously, thereby straightening the carbon nano tube fibers by pulling, and squeezing to allow the carbon nano tube fibers to shrink by the through hole; meanwhile, fully soaking the carbon nano tube fibers with a functional polymer solution, so as to obtain an integral yarn. Without adoption of the conventional yarn twisting method, strength loss of the carbon nano tube fibers in the early stage and unevenness of the yarn structure both caused by twisting are avoided, and weak links of strength of the yarn are decreased; the yarn prepared by the method has the advantages that interference bonding strength of fibers of the yarn is enhanced, breakage simultaneity of the fibers is improved, utilization rate of fiber strength is increased, and the yarn has high strength and good flexibility, thermal stability and wear-resistance performance.

Description

technical field [0001] The invention relates to a method for preparing carbon nanotube yarns, in particular to a method for preparing high-performance carbon nanotube yarns in a non-twisting manner, and belongs to the technical field of nanocomposite materials. Background technique [0002] Carbon nanotubes are new materials in the 21st century, with high strength, ultra-light mechanical properties and special thermal and electrical properties. In order to realize engineering applications, the existing technology assembles them into carbon nanotube fibers, which are one-dimensional macroscopic manifestations of carbon nanotubes, generally with a diameter of about 1-10 μm, and the size is still small, and the current research on carbon nanotubes The direction and application direction also focus on the nanometer or micrometer size. In order to further develop and deepen the research and application of macroscopic materials of carbon nanotubes, it is necessary to structurally ...

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Problems solved by technology

[0006] However, the aforementioned prior art has some disadvantages in processing and performance, such as non-simultaneity of fiber breakage, weak interfacial bonding force between fibers, unevenness of yarn structure caused by twisting, and low utilization rate of yarn strength. Wait

For example, the aforementioned prior art mostly adopts the twisting method, and the non-simultaneity of fiber breakage is mainly reflected in: after twisting, the fiber in the outermost layer of the yarn has the largest inclination angle, and when it is stretched by an external force, the fibers in the outer layer It will be the first to be stressed and will be stretched and tensioned. Therefore, when the material is under stress, the outer fiber will break first, and then the inner fiber will continue to bear the external force until the yarn is broken as a whole. Therefore, each fiber exists The non-synchronicity of fracture will cause the fibers in the yarn to not function simultaneously to resist external forces; the weak interfacial bonding between fibers is mainly reflected in: the carbon nanotube yarn assembled by twisting, there is no gap between the fiber and the fiber surface Due to the combination or bonding of chemical bonds or substances, the interface between fibers and adjacent fibers is clearly separated. When stretched by external force, the fibers will slip or slip, resulting in the inability to exert the full strength of each fiber; The unevenness of the yarn structure caused by twisting is mainly reflected in: after twisting, the fibers will be inclined, and the effective component force of the fiber axis will decrease; and the strength of the fibers has been lost during the twisting process; at the same time, during the twisting process , the degree of fiber transfer is inconsistent, which enhances the unevenness of the yarn structure and aggravates the weak ring of yarn strength; the low utilization rate of yarn strength is mainly reflected in the fact that there is a large difference in mechanical properties between fibers and each fiber has Strong and weak rings, in addition to the different degrees of inclination of the surface of the fibers after twisting, the elongation during the stretching process is inconsistent, so that the strength of the fibers is low, and the effective strength of the carbon nanotube yarn is low

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