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Method for preparing continuous hollow SiO2 porous fibers through non-coaxial spinning

A porous fiber, non-coaxial technology, applied in the field of SiO2 porous fiber preparation, can solve the limitation of fiber equipment precision, difficult fiber fine denier, coaxial spinning needle or hollow spinneret equipment preparation and use process Explore complex issues to achieve the effect of simple equipment, easy access to raw materials, and abundant pores

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

At present, the method of wet spinning to prepare continuous hollow fibers mainly relies on coaxial spinning needles or hollow spinnerets, but the fibers in this method are limited by the precision of the equipment, and it is difficult to achieve fine denier of fibers
At the same time, the preparation, use and process exploration of the coaxial spinning needle or the hollow spinneret are relatively complicated.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Sodium water glass with a modulus of 2,50 Baume degrees was used as the spinning stock solution, and 0.8 mol / L dilute sulfuric acid solution was used as the coagulation bath, and the reactive wet spinning was carried out under normal temperature and pressure. The hollow orthosilicic acid / silicate fiber formed in the coagulation bath was wound at a winding speed of 0.1 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 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 solution in the fiber, and dry it under natural conditions to obtain continuous hollow SiO 2 Porous fibers. The spinning process is very smooth and continuous. Hollow SiO 2 The specific surface area of ​​the porous fiber is 473.6m 2 / g, the mo...

Embodiment 2

[0035] Potassium water glass with a modulus of 3 and 35 degrees Baume was used as the spinning stock solution, and 0.4 mol / L dilute sulfuric acid solution was used as the coagulation bath, and the reaction wet spinning was carried out under normal temperature and pressure. The orthosilicic acid / sodium silicate fiber formed in the coagulation bath was wound at 0.5 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 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 solution in the fiber, and dry it under natural conditions to obtain continuous hollow SiO 2 Porous fibers. Occasionally, there is a phenomenon of broken filaments during the spinning process. Prepared SiO 2 The specific surface area of ​​the porous fi...

Embodiment 3

[0037] Potassium water glass with a modulus of 3 and 35 degrees Baume was used as the spinning stock solution, and 0.6 mol / L dilute sulfuric acid solution was used as the coagulation bath, and the reactive wet spinning was carried out under normal temperature and pressure. The orthosilicic acid / potassium silicate fiber formed in the coagulation bath was wound at a speed of 1 m / s. The wound fiber was immersed in 0.1mol / L dilute sulfuric acid for 5 days for aging, and the transformation from 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 solution in the fiber, and dry it under natural conditions to obtain continuous hollow SiO 2 Porous fibers. There is no broken filament during the spinning process. Prepared SiO 2 The specific surface area of ​​the porous fiber is 302.1m 2 / g, the most pr...

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Abstract

The invention relates to a method for preparing continuous hollow SiO2 porous fibers through non-coaxial spinning. The method comprises steps as follows: a spinning solution is prepared from silicate; a strong acid solution is added to a coagulating basin to serve as a coagulating bath; the spinning solution is put in the coagulating bath, has a reaction and performs wet spinning, hollow orthosilicic acid / silicate fibers are obtained and subjected to winding, and the fibers after winding are immersed in an ageing solution for ageing; the fibers are washed to be neutral with deionized water after ageing, solutions in the fibers are replaced through ethanol, the fibers are dried, and the continuous hollow SiO2 porous fibers are obtained. According to the method, 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 prepared with the method have rich pores, ultrahigh specific surface area and high temperature resistance and chemical corrosion resistance, meanwhile, the specific surface area of the fibers can be adjusted, and the continuous hollow SiO2 porous fibers have more advantages in the fields such as catalysis, adsorption, filtration and the like than ordinary porous fibers.

Description

technical field [0001] The invention belongs to SiO 2 The field of preparation of porous fibers, especially related to the preparation of continuous hollow SiO by non-coaxial spinning 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08
CPCD01F9/08
Inventor 朱美芳孟思王兴平陈文萍
Owner DONGHUA UNIV
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