Preparation of silicon dioxide / polyvinylidene fluoride composite nano fiber film

A composite nanofiber, polyvinylidene fluoride technology, applied in fiber processing, fiber chemical characteristics, rayon manufacturing and other directions, can solve the problems of difficult shape control, high raw material cost, strict equipment requirements, etc., to achieve good photoelectric performance, reaction Fast, powerful effects

Inactive Publication Date: 2009-07-15
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Preparation of silicon dioxide / polyvinylidene fluoride composite nano fiber film
  • Preparation of silicon dioxide / polyvinylidene fluoride composite nano fiber film

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Add 20ml of ethylene glycol and 2ml of tetraethylorthosilicate into a three-necked round-bottomed flask, heat in a water bath to 70°C, add 1ml of deionized water drop by drop using a pipette, and react for 2 hours under normal pressure. Gradually lower the temperature to 50°C, connect to a distillation device, distill off part of the water generated by the reaction, and promote the dehydration reaction between ethylene glycol and the hydroxyl groups on the surface of the silica. The reaction time is 1 hour; the silica sol system generated by the reaction is placed in into the extractor shown, using acetone as the extracting solution, heated to 65°C in a water bath, and obtained pure modified nano-silicon dioxide after 5 hours; mixed 25.7ml of acetone, 2g of PVDF and 0.2g of silicon dioxide into the Erlenmeyer flask, Use a magnetic stirrer to stir for 2 hours to obtain a uniformly mixed PVDF / silica / acetone system, put it into a self-made spinning equipment, and under the ...

example 2

[0019] Add 20ml of ethylene glycol and 2ml of tetraethyl orthosilicate into a three-necked round-bottomed flask, heat it in a water bath to 70°C, add 1.5ml of deionized water drop by drop using a pipette, raise the temperature to 90°C, and put it under normal pressure React for 1.5 hours. Gradually lower the temperature to 50°C, connect to a distillation device, distill off part of the water generated by the reaction, and promote the dehydration reaction between ethylene glycol and the hydroxyl groups on the surface of the silica. The reaction time is 1 hour; the silica sol system generated by the reaction is placed in into the extractor shown, using acetone as the extracting solution, heated to 65°C in a water bath, and obtained pure modified nano-silica after 5 hours; mixed 24.4ml of acetone, 3g of PVDF and 0.2g of silicon dioxide into the Erlenmeyer flask, Use ultrasonic vibration for 1 hour to obtain a uniformly mixed PVDF / silica / acetone system, put it into self-made spinn...

example 3

[0021] Add 20ml of ethylene glycol and 2.5ml of tetraethyl orthosilicate into a three-neck round bottom flask, heat it in an oil bath to 70°C, add 2ml of deionized water drop by drop using a pipette, raise the temperature to 110°C, and press The reaction was carried out for 0.5 hours. Gradually lower the temperature to 50°C, connect to a distillation device, distill off part of the water generated by the reaction, and promote the dehydration reaction between ethylene glycol and the hydroxyl groups on the surface of the silica. The reaction time is 1 hour; the silica sol system generated by the reaction is placed in into the extractor shown, using acetone as the extracting solution, heated to 65°C in a water bath, and obtained pure modified nano-silicon dioxide after 5 hours; mixed 23.2ml of acetone, 4g of PVDF and 0.2g of silicon dioxide into the Erlenmeyer flask, Use a magnetic stirrer to stir for 1 hour, and ultrasonically oscillate for 15 minutes to obtain a uniformly mixed...

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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. ...

Claims

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Application Information

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IPC IPC(8): D04H3/16D01D5/00D01F6/48D01F1/10
Inventor 魏取福黄锋林吴宁陶丹肖学良
Owner JIANGNAN UNIV
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