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Method for preparing continuous hollow SiO2 porous fibers through coaxial spinning

A porous fiber and coaxial spinning technology, which is applied in the direction of inorganic raw material artificial filaments, etc., can solve the problems of slow adsorption speed, limited application range, and low separation efficiency, and achieve the effect of cheap raw materials and simple equipment

Active Publication Date: 2016-03-30
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of air or water purification, the granular or powdery structure is prone to stacking, its adsorption speed is slow, and the separation efficiency is not high, especially its physical form is inconvenient in application, which limits the scope of application

Method used

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  • Method for preparing continuous hollow SiO2 porous fibers through coaxial spinning
  • Method for preparing continuous hollow SiO2 porous fibers through coaxial spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Soda water glass with a modulus of 2 and 50 Baume degrees is used as the spinning stock solution, and 0.4mol / L dilute sulfuric acid solution is used as the coagulation bath and core layer spinning solution. The outer diameter is 0.8mm and the inner diameter is 0.6mm. The coaxial spinning needle is used for reactive wet spinning under the condition that the flow rate of the solution in a single spinneret hole is 0.02ml / s. The hollow orthosilicic acid / silicate fiber formed in the coagulation bath was wound at a winding speed of 0.1 m / s. The wound fiber was immersed in 0.005mol / L dilute sulfuric acid for 10 days for aging, so as to realize the transformation from hollow orthosilicic acid / silicate fiber to SiO 2 The fibers are transformed, and a large number of holes are formed at the same time. After aging, the fibers were washed with deionized water until neutral. Use absolute ethanol to replace the solvent in the fiber, and dry under natural conditions to obtain hollow ...

Embodiment 2

[0032] Potassium silicate with a modulus of 3 and 35 Baume degrees is used as the spinning stock solution, and 0.2mol / L dilute sulfuric acid solution is used as the coagulation bath and the core layer spinning solution. The outer diameter is 0.8mm and the inner diameter is 0.6mm. The coaxial spinning needle is used for reactive wet spinning under the condition that the solution flow rate of a single spinneret hole is 0.03ml / s. The orthosilicic acid / sodium silicate fiber formed in the coagulation bath was wound at a winding speed of 0.5 m / s. The wound fibers were immersed in 0.005mol / L dilute sulfuric acid for 10 days for aging, and the transformation from hollow orthosilicic acid / silicate fibers to hollow SiO 2 The fibers are transformed, and a large number of holes are formed at the same time. After aging, the fibers were washed with deionized water until neutral. Use absolute ethanol to replace the solvent in the fiber, and dry under natural conditions to obtain hollow SiO...

Embodiment 3

[0034] Potassium silicate with a modulus of 3 and 35 degrees Baume is used as the spinning stock solution, and 0.4mol / L dilute sulfuric acid solution is used as the coagulation bath and core layer spinning solution. The outer diameter is 1mm and the inner diameter is 0.7mm. Shaft spinning needles, under the condition that the solution flow rate of a single spinneret hole is 0.08ml / s, the reaction wet spinning is carried out. The orthosilicic acid / potassium silicate fiber formed in the coagulation bath was wound at a winding speed of 1 m / s. The wound fibers were immersed in 0.1mol / L dilute sulfuric acid for 5 days for aging to realize the transition from hollow orthosilicic acid / silicate fibers to hollow SiO 2 The fibers are transformed, and a large number of holes are formed at the same time. After aging, the fibers were washed with deionized water until neutral. Use absolute ethanol to replace the solvent in the fiber, and dry under natural conditions to obtain hollow SiO ...

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Abstract

The invention relates to a method for preparing continuous hollow SiO2 porous fibers through coaxial spinning. The method comprises steps as follows: a spinning stock solution is prepared from silicate or silanol sol; one acid solution is added to a coagulating tank to be used as a coagulating bath, and the other identical acid solution is used as a coaxial spinning core spinning solution; the spinning stock solution and the coaxial spinning core spinning solution are injected into the coagulating bath through coaxial spinning needles at the same flow rate, reaction wet spinning is performed, hollow orthosilicic acid / silicate fibers are obtained, wound, aged and washed to be neutral with deionized water, solvent displacement is performed, and the continuous hollow SiO2 porous fibers are obtained through drying. The method has the characteristics that equipment is simple, raw materials are cheap and easy to obtain, the reaction process is simple and the spinnability is good. The hollow inorganic SiO2 porous fibers obtained with the method have rich pores and ultra-large specific surface area, are resistant to the high temperature and chemical corrosion, and have more advantages than common porous fibers in fields of catalysis, adsorption, filtration and the like.

Description

technical field [0001] The invention belongs to the field of preparation of porous fibers, in particular to a method for coaxial spinning to prepare continuous hollow SiO 2 porous fiber method. Background technique [0002] Porous materials have a high specific surface area and can provide a large number of reaction / interaction active centers, which are particularly beneficial to processes related to interfacial interactions, such as adsorption, catalysis, and electrochemical interactions; their pores can be used as multifunctional storage and monodisperse nano-reactions Its special nanopore and its shape bring a rich space and place for interdisciplinary research, such as the diffusion behavior of biomolecules, drug molecules, and reactant molecules in the nanopore, the contact performance with the active center, The reactivity and so on are closely related to the pore structure; and the surface effect and quantum size effect brought by its nanoscale network structure make...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08
CPCD01F9/08
Inventor 朱美芳孟思陈文萍成艳华
Owner DONGHUA UNIV
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