Preparation method of polylactic acid conductive fibers

Abstract

The invention discloses a preparation method of polylactic acid (PLA) conductive fibers. The preparation method comprises the following steps: firstly configuring treating liquid, wherein the concentration of a conductive filler in the treating liquid is 0.5-20 mg / mL, and the concentration of polyvinyl acetate (PVAc) is 10-100 mg / mL; weighing the conductive filler and the PVAc according to the concentration requirements, adding into a solvent and performing magnetic stirring and ultrasonic dispersion on the treating liquid, so that the conductive filler is uniformly dispersed in the treating liquid; then unwinding PLA fibers from a bobbin, enabling the PLA fibers to enter the treating liquid, then drying through a drying device and finally winding the treated PLA fibers on the bobbin to prepare the PLA conductive fibers. The resistivity of the conductive fibers is reduced to 500 omega.m, and the conductive fibers can be used for electrode, antistatic, low-temperature heating, electromagnetic shielding, heat sensitive and gas sensitive materials.

Description

technical field [0001] The invention relates to the field of polymer processing, in particular to a preparation method of polylactic acid (PLA) conductive fibers. Background technique [0002] PLA resources are renewable, biodegradable, and biocompatible. At the same time, it is a thermoplastic polymer material that can be directly melt-spun to produce fibers. At present, the melt-spinning technology of PLA is mature, and PLA is expected to replace Petroleum-based polymer materials become the raw materials of chemical fibers to solve the problems of resource shortage and environmental pollution faced by the development of synthetic fibers. However, the research and development work on the functionalization of PLA fibers is less, and the conductive functionalization of fibers is the focus of development and research in the industry and academia. Therefore, it is necessary to realize the conductive functionalization of PLA fibers. At present, only Germany Petra at the Dresden...

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Problems solved by technology

However, the research and development work on the functionalization of PLA fibers is less, and the conductive functionalization of fibers is the focus of development and research in the industry and academia. Therefore, it is necessary to realize the conductive functionalization of PLA fibers. At present, only Germany Petra at the Dresden Institute for Polymer Research 【 P.; Kobashi, K.; Villmow, T.; Andres, T.; Paiva, M.C.; Covas, J.A. Liquid sensing properties of melt processed polypropylene / poly(ε-caprolactone blends containing multiwalled carbon nanotubes. ,1451-1460.], Zou Liming of Donghua University [CN201210442761.3] and Zhang Yingchen [CN200810203173.8], Liu Qingsheng of Jiangnan University [CN201210529260.9, CN201210529341.9], Li Xuming of Shaoxing University of Arts and Sciences [CN201310434510.5], etc. Through the method of volume exclusion effect, a conductive network is formed inside the PLA fiber, and the PLA conductive fiber is prepared. However, in this method, a polymer that is incompatible or partially compatible with PLA needs to be introduced, which will affect the spinnability of PLA. And the mechanical properties of conductive fibers have adverse effects. In addition, conductive fillers are easy to block the spinneret holes, which makes spinning difficult, so that the method is difficult to industrialize.