Double-wall structured hollow ultrafine polymer fiber and preparation method thereof

Abstract

The invention discloses a double-wall structured hollow ultrafine polymer fiber and a preparation method thereof. The preparation method includes a first step of enabling 100-300 parts of polymers A and 300-1000 parts of solvent A to be added in a dissolving kettle provided with a stirrer and a thermometer, stirring and dissolving the polymers A and the solvent A under temperature of 30-100 DEG C, carrying out defoaming and curing for 10-12 hours at vacuum degree of 0.03-0.05 MPa, and obtaining polymer shell layer spinning solution, a second step of enabling 0.5-100 parts of polymers B and 10-1000 parts of solvent B to be added into the dissolving kettle provided with the stirrer and the thermometer, stirring and dissolving the polymers B and the solvent B under temperature of 30-100 DEG C, carrying out defoaming and curing for 10-12 hours at vacuum degree of 0.03-0.05 MPa, and obtaining polymer core layer spinning solution, a third step of enabling the polymer shell layer spinning solution and the polymer core layer spinning solution to pass through a core layer spinning nozzle and a shell layer spinning nozzle, wherein the inner diameter of the core layer spinning nozzle is 0.3-0.6 mm, and flow rate is 1-8 mm / h, the inner diameter of the shell layer spinning nozzle is 0.8-1.2 mm, and the flow rate is 5-10 mm / h, spinning voltage is 15-25 kilovolts, and finally manufacturing the double-wall structured hollow ultrafine polymer fiber through electrostatic spinning. The polymers A can form the outer layer of a hollow polymer fiber wall, and the polymers B can form the inner layer of the hollow polymer fiber wall.

Description

Technical field: [0001] The invention relates to a hollow ultrafine polymer fiber with a double-wall structure and a preparation method thereof, belonging to the field of preparation of hollow ultrafine polymer fiber materials. Background technique: [0002] Hollow ultrafine polymer fibers have the advantages of light weight, high porosity, and large specific surface area, and are widely used in biomedicine, drug sustained release, sound insulation materials, clothing, and high-efficiency sensors for health care. [0003] Electrospinning is currently the most common method for preparing hollow ultrafine polymer fibers. The methods used in this method mainly include: post-treatment method, single needle emulsion spinning method and coaxial electrospinning method. However, the first two processes have obvious deficiencies, which are mainly reflected in the cumbersome post-treatment process, the imperfect hollow structure of the obtained hollow ultrafine fibers, and the discont...

AI Technical Summary

Problems solved by technology

Judging from the current reports, this method mainly uses single-wall hollow microfibers prepared by binary needles or double-wall hollow microfibers prepared by three-element needles, but both have disadvantages: the single-wall structure is single, The application of fibers is limited; although the ternary needle can produce double-walled hollow fibers, the processing technology of the ternary needle is difficult, the requirements for equipment are high, the operation is complicated, and the stability is poor

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