Electrostatic spinning liquid for silicon dioxide fibers and method for preparing porous silica dioxide fibers by utilizing electrospinning method

A porous silica, electrospinning technology, applied in spinning solution preparation, fiber chemical characteristics, fiber processing and other directions, can solve the problem that the material flexibility is difficult to maintain, the fiber and its upper pore structure size is difficult to control, and the cumbersome experimental steps and other problems, to achieve the effect of good durability, good application prospects, and reduced control difficulty

Inactive Publication Date: 2017-11-17
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods are mainly used to prepare porous fibers composed of organic polymer materials on the one hand. When preparing porous fibers from non-polar materials, it is difficult to maintain the flexibility of the material itself, and it is difficult to control the size of the fibers and their upper pore structures. On the other hand, The post-processing process requires more and cumbersome experimental steps

Method used

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  • Electrostatic spinning liquid for silicon dioxide fibers and method for preparing porous silica dioxide fibers by utilizing electrospinning method
  • Electrostatic spinning liquid for silicon dioxide fibers and method for preparing porous silica dioxide fibers by utilizing electrospinning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1, take 1g of silica sol and add 50mg of carbon nanospheres with an average diameter of 110nm, ultrasonically disperse evenly (0.5h), then add 1g of PVA aqueous solution with a mass fraction of 11% therein, stir until uniform (4h), and obtain The homogeneous sol / pore forming agent / polyvinyl alcohol metastable system is the electrospinning solution;

[0026] Wherein, the preparation method of silica sol is: use orthoethyl silicate (TEOS) as silica sol precursor, use water as solvent, H 3 PO 4 (85%) As a catalyst, tetraethyl orthosilicate: water: H 3 PO 4 Be mixed in the ratio of 1:1:0.01 by mass ratio (wherein, H 3 PO 4 It needs to be added dropwise within 30-60 minutes), and then stirred at room temperature for 6 hours to fully hydrolyze and condense the inorganic precursor to form a silica sol;

[0027] Wherein, the preparation of the PVA aqueous solution: add PVA to water, heat to dissolve and stir evenly to obtain the PVA aqueous solution, which is set asid...

Embodiment 2

[0032] Step 1. Take 1 g of the silica sol prepared in Example 1 and add 75 mg of polymethyl methacrylate nanospheres with an average diameter of 300 nm. Ultrasonic dispersion is uniform (0.5 h), and then an aqueous PVA solution with a mass fraction of 11% is added thereto. 1g, stirred until uniform (4h), to obtain a homogeneous sol / pore forming agent / polyvinyl alcohol metastable system, which is the electrospinning solution.

[0033] Step 2. Inject the electrospinning solution into a 1mL syringe with a stainless steel needle, control the spinning speed to 250 μL / min, adjust the spinning voltage to 10kV, and adjust the nozzle (i.e., the stainless steel needle) to the receiving plate (covered with tinfoil) ) distance of 15cm, can be collected on the receiving plate to obtain silica / PMMA nanospheres / PVA composite fiber (fiber interweaving into film)

[0034] Step 3. Dry the obtained composite fiber (membrane) in an oven at 80°C for 2 to 4 hours, then place it in a muffle furnace,...

Embodiment 3

[0037]Step 1. Take 1g of silica sol and add 100mg of polystyrene nanospheres with an average diameter of 200nm, ultrasonically disperse evenly (0.5h), then add 1g of PVA aqueous solution with a mass fraction of 11%, and stir until uniform (4h) , to obtain a homogeneous sol / pore forming agent / polyvinyl alcohol metastable system, which is the electrospinning solution.

[0038] Step 2. Inject the electrospinning solution into a 1mL syringe with a stainless steel needle, control the spinning speed to 250 μL / min, adjust the spinning voltage to 10kV, and adjust the nozzle (i.e., the stainless steel needle) to the receiving plate (covered with tinfoil) ) at a distance of 15 cm, the silica / PS nanosphere / PVA composite fiber (fiber interwoven into a film) can be collected on the receiving plate.

[0039] Step 3. Dry the obtained composite fiber (membrane) in an oven at 80°C for 2 to 4 hours, then place it in a muffle furnace, heat it to 750°C in air at a heating rate of 10°C / min, and ke...

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Abstract

The invention discloses electrostatic spinning liquid for silicon dioxide fibers and a method for preparing porous silica dioxide fibers by utilizing an electrospinning method. The electrostatic spinning liquid is composed of silica dioxide sol, polyvingakohol, a pore-forming agent and the like. The pore-forming agent is the mixture composed of one of or two of carbon nanospheres, polymethyl methacrylate nanospheres, polystyrene nanospheres. Through electrospinning, silicon dioxide/pore-forming agents/polyvingakohol composite fibers are obtained. Through high-temperature calcination, pore-forming agents and polyvingakohol can be oxidized and decomposed. Therefore, porous silica dioxide fiber structure is obtained by the above preparation steps. The porous silica dioxide fibers obtained by preparation are featured by being resistant to high temperature and corrosion. Meanwhile, the porous silica dioxide fibers are soft, highly endurable, which can be used for multiple environments such as acid or alkali and can also be used for surface absorption and separation, absorption of catalyst carriers and ions and sewage treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional fibers, and relates to a preparation method of inorganic porous fibers, in particular to a preparation method of porous silica micro-nano fibers. Background technique [0002] Electrospinning technology is widely used to prepare one-dimensional fiber materials. The formed fibers have the advantages of large specific surface area, diverse components, and adjustable sizes. They are favored by researchers as biological substrates, electrode materials, catalysts, and environmental filter membranes. Among them, due to the characteristics of low density, large specific surface area, high adsorption capacity, and large surface roughness, the electrospun porous fiber greatly expands the application field of the electrospun fiber, making it suitable for filtration, adsorption, tissue growth, etc. The application performance in related fields has been significantly improved, and the prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D1/02D01F9/08D01F11/00D01D5/00
CPCD01D1/02D01D5/0015D01F9/08D01F11/00
Inventor 常梦洁
Owner XIAN UNIV OF SCI & TECH
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