Electrostatically spun fiber flocculus and preparation method thereof

Abstract

The invention discloses an electrostatically spun fiber flocculus and a preparation method thereof. The preparation method comprises the steps that a spinning solution A and a spinning solution B with different concentrations are subjected to electrostatic spinning through a cross-type bidirectional electrostatic spinning device, micron fibers and nano fibers are spun out respectively, the micron fibers and the nano fibers are stacked on a positive-pressure hot air receiving device in a curled shape and subjected to an in-situ cross-linking reaction under the action of hot air, and finally the electrostatically spun fiber flocculus is obtained; and the cross-type bidirectional electrostatic spinning device comprises a first spinning module and a second spinning module which are connected with a positive voltage power source and a negative voltage power source respectively, and polymer charged jet flows sprayed out of the first spinning module and the second spinning module are received on a positive pressure hot air receiving device to form the electrostatically spun fiber flocculus. The invention provides the method for preparing the electrostatically spun fiber flocculus with good tensile property and high compression resilience in one step.

Description

technical field [0001] The invention relates to a lightweight and high-strength electrostatic spinning fiber flake and a preparation method thereof, belonging to the technical field of electrostatic spinning fibers. Background technique [0002] Electrospinning technology has the characteristics of low cost, strong controllability, and wide source of raw materials. The fiber materials prepared by it have the characteristics of fine diameter, small pore size and high porosity. It has broad applications in the fields of sound absorption and heat preservation, air filtration and tissue engineering. Application prospect. However, the fluffy flakes prepared by electrospinning technology are usually composed of disordered accumulation of fibers, and the fluffy structure is easy to collapse after compression, and the tensile properties are poor. In addition, the preparation of existing electrospun wadding materials needs to be carried out in a high-humidity environment (RH≥80%), w...

AI Technical Summary

Problems solved by technology

However, the fluffy flakes prepared by electrospinning technology are usually formed by disordered accumulation of fibers. After the flakes are compressed, the fluffy structure is easy to collapse, and the tensile properties are poor.

In addition, the preparation of existing electrospun wadding materials needs to be carried out in a high-humidity environment (RH ≥ 80%), which is highly dependent on environmental humidity

These problems make electrospun fiber flakes unable to meet their actual use requirements in various industries, limiting their application in many fields

[0003] Patent ZL201710818067.X discloses a preparation method and device for a fluffy and elastic three-dimensional micro-nano fiber material, as well as the fiber material prepared by this method and its application. The electrospinning technology is combined with the traditional flake preparation technology, and the thicker The micron fibers and nanofibers produced by electrospinning are uniformly mixed under gaseous conditions, and then after heat treatment, a fluffy and elastic three-dimensional micronanofiber material with high porosity, low density and high specific surface area is obtained, but the equipment needs additional equipment Carding device, and there are large noises and serious flying flocs during the airflow carding and dispersing process

Patent CN201710358539.8 discloses "An Electrospinning Device and Method for Preparing Fluffy Nanofibers". By introducing an air supply device on the side of the injection device, the sheath gas is introduced during the spinning process to obtain fluffy nanofibers, which can be prepared Nanofiber materials with a certain fluffiness are produced, but the airflow at the nozzle is likely to have a greater impact on the stability of the spinning jet. At the same time, the obtained nanofibers are all ordinary cylindrical, only simple and fluffy accumulation, and the fluffy structure is unstable, which cannot be guaranteed. long-term use

Document Nanoscale, 2019, 11, 8185 provides a preparation method of ultra-light and structurally stable three-dimensional fiber aggregates, applying uniform water mist in the receiving area of ​​electrospun fibers, and using organic solvent vapor to cross-link the flakes , the organic solvent vapor dissolves the surface of the fiber, so that the fusion of adjacent fiber intersections occurs, and the overall structure does not break down, but the steam crosslinking time is long, the process is complicated, and the organic solvent recovery is difficult, which is harmful to the human body and the environment. Harmful, not conducive to mass production

Images