Internal multi-section type high-yarn-forming-strength air-jet vortex spinning process and application thereof

The invention discloses an internal multi-section type high-yarn-forming-strength air-jet vortex spinning process and application thereof, and belongs to the technical field of yarn spinning. In order to solve the technical problems that in the prior art, the mechanical strength of yarn manufactured through vortex spinning needs to be further improved, and a large number of fiber thread ends exist on the surface of the yarn, the internal multi-section type high-yarn-forming-strength air-jet vortex spinning technology comprises the following steps that carboxymethyl cellulose, lactide, a catalyst and N, N-dimethylformamide are mixed, and then the mixture is stirred to be uniform; the preparation method comprises the following steps: adding N, N-dimethylformamide into a three-neck flask under the protection of nitrogen, raising the temperature of the three-neck flask to 140-150 DEG C, and reacting for 60-90 minutes; the composite fiber is synthesized, the breaking strength and the breaking elongation of the yar