Polyimide nanofiber yarn and preparation method thereof suitable for industrial production

Abstract

The invention provides a polyimide nanofiber, which is obtained by electrospinning a polyimide precursor solution, wherein the polyimide precursor is obtained by copolymerization of triphenyl diether dianhydride, dimethyl benzidine and other monomers with specific structures. A nanofiber yarn is prepared from polyimide containing a flexible group in a main chain as the raw material; the nanofiber yarn is endowed with a plurality of characteristics of the polyimide, and the properties of high temperature resistance, good thermal insulation effect, antibacterial mouldproof performance, permanent flame retardant property and the like; and meanwhile, the flexibility of the nanofiber yarn can also be improved. Through introduction of flexible monomers triphenyl diether dianhydride and dimethyl benzidine, electrospinning of the polyimide nanofiber with high bulkiness and certain elasticity in industrial production is facilitated; the polyimide nanofiber capable of keeping the original shape can also be obtained after imidization; meanwhile, the obtained yarn has relatively good flexibility. Meanwhile, the invention further provides a preparation method of the polyimide nanofiber yarn suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of chemical fiber spinning, and in particular relates to a nanofiber yarn and a preparation method suitable for industrial production, in particular to a polyimide nanofiber yarn and a preparation method suitable for industrial production. Background technique [0002] With the improvement of people's living standards, people have higher and higher requirements for fabrics, not only considering the function of fabrics, but also considering their comfort. Therefore, researchers in the industry have been continuously improving and improving the material and preparation process of fiber yarns. Among them, fiber yarns made of nano-scale materials greatly reduce the stiffness of filaments due to their ultra-fine fiber diameters. The thread feels extremely soft, and the fine fibers can also increase the layered structure of the thread, increase the specific surface area and capillary effect, and make it have good ...

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Problems solved by technology

For example: Dalton [polymer200546 (3) 611-614] uses a double disc collection device to collect nanofiber yarns, but the prepared yarns are discontinuous and the length is too short to meet the actual production application

Chinese patent [Application Publication No.: CN102277668A] discloses a preparation method and device for electrospinning nanofiber yarns. The specific method is to collect nanofibers into yarns by using a vacuum funnel-type receiving device, but the yarns in trial production The twist is difficult to control

Chinese patent [application publication number: CN103305931A] discloses a method and device for preparing polyacrylonitrile pre-oxidized nanofiber yarn by electrospinning. The specific method is to use the motor in the device to twist the collected nanofibers into yarn, Then obtain polyacrylonitrile pre-oxidized silk nanofibers through pre-oxidation, but in the actual production process, the yarn is collected and wound in the same area, which has a certain impact on the quality of the yarn. The preparation and pre-oxidation of the yarn is Two independent steps cannot form continuous preparation, which greatly affects production efficiency

Chinese patent [Application Publication No.: CN104695066A] discloses a rotary-type electrospinning nanofiber yarn preparation device and its preparation method. The specific method is to use a rotating ring collector to rotate and twist the nanofiber into yarn, but This method is not easy to control the uniformity of the yarn, and it is not suitable for the preparation of continuous polyimide nanofiber yarns that need to be processed by heat treatment, so it cannot be industrialized.

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