Preparation of silicon dioxide / polyvinylidene fluoride composite nano fiber film

Abstract

A preparation method of a silicon dioxide / polyvinylidene fluoride composite nano-fiber membrane relates to the technical fields of preparing modified nano-silicon dioxide by a sol-gel method, preparing a silicon dioxide / polyvinylidene fluoride nano-fiber membrane by an electrostatic spinning device and the like. The preparation method comprises the following steps: preparing the modified nano-silicon dioxide in virtue of a sol-gel principle by a one-step method; mixing the modified nano-silicon dioxide with the polyvinylidene fluoride; and preparing the composite nano-fiber by an electrostatic spinning technology. The preparation method helps relieve the disadvantages of low strength of the nano-fiber, long preparation flow of the modified nano-silicon dioxide, complex process and the like in the electrostatic spinning technology. The nano-fiber prepared by the method has the advantages of high strength, high machinability, short fiber diameter and uniform distribution and can be widely applied to a plurality of fields such as lithium ion battery diaphragm, filtering, biomedical material and the like.

Description

technical field [0001] The invention relates to a preparation method of a composite nanofiber membrane, in particular to a method for preparing modified nano-silica by a sol-gel method, and a method for preparing a polysilica / vinylidene fluoride nanofiber membrane by using an electrostatic spinning device. Background technique [0002] Electrospinning is a new spinning technology that uses charged polymer solution or melt to flow and deform in an electrostatic field to prepare nanometer to submicron-sized polymer fibers. Compared with polymer fibers prepared by general methods, electrospinning The prepared fiber has the advantages of thin fiber, large specific surface area, etc., and the spinning equipment is simple and easy to operate. It is precisely because of the above advantages that nanofibers prepared by electrospinning technology have broad application prospects in the fields of filtration, tissue engineering, ultra-sensitive sensors, bionics, and medical treatment. ...

AI Technical Summary

Problems solved by technology

The gas phase method is the main method for preparing high-purity silica. The product has a narrow primary particle size distribution and good dispersion, but it has the disadvantages of complex process, strict equipment requirements and high raw material cost; the traditional precipitation method is usually based on water glass. Raw materials, although the method has a wide range of raw materials and low prices, the silica prepared is not high in purity, has a wide particle size distribution, and is difficult to control in shape; the sol-gel method is one of the common methods for synthesizing nano-silica. Alkoxide is the precursor, which is gradually gelled by hydrolysis and polycondensation, and then aged and dried to obtain nano-silica, but there are disadvantages such as complex process and too many hydroxyl groups on the surface of silica.

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