A method for preparing continuous SiO2 porous fibers with high specific surface area by natural drying method

A high specific surface area, natural drying technology, applied in the direction of inorganic raw materials artificial filaments, etc., can solve the problem of not being able to prepare a single long fiber, and achieve the effect of abundant pores, easy access to raw materials, and adjustable fiber specific surface area

Active Publication Date: 2018-04-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current literature reports the preparation of SiO 2 The methods of porous fibers include chemical synthesis, template method, and centrifugal spinning method, but none of these methods can prepare continuous single long fibers.

Method used

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  • A method for preparing continuous SiO2 porous fibers with high specific surface area by natural drying method
  • A method for preparing continuous SiO2 porous fibers with high specific surface area by natural drying method
  • A method for preparing continuous SiO2 porous fibers with high specific surface area by natural drying method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Sodium water glass with a modulus of 2 and 50 Baume degrees was used as the spinning stock solution, and 0.4mol / L dilute sulfuric acid solution was used as the coagulation bath to carry out reactive wet spinning. The 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 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 SiO 2 Porous fibers. The spinning process is very smooth and continuous. Prepared SiO 2 The specific surface area of ​​porous fibers is 449.1m 2 / g, the most probable pore size is 10nm, and 60% of the maximum adsorption capac...

Embodiment 2

[0033] Potassium water glass with a modulus of 3 and 35 degrees Baume was used as the spinning stock solution, and 0.2mol / L dilute sulfuric acid solution was used as the coagulation bath to carry out reactive wet spinning. The orthosilicic acid / sodium silicate fiber formed in the coagulation bath was wound at a winding speed of 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 SiO 2 Porous fibers. Occasionally, there is a phenomenon of broken filaments during the spinning process. Prepared SiO 2 The specific surface area of ​​porous fibers is 335.1m 2 / g, the most probable pore size is 1...

Embodiment 3

[0035] Potassium water glass with a modulus of 3 and 35 degrees Baume was used as the spinning stock solution, and 0.4mol / L dilute sulfuric acid solution was used as the coagulation bath to carry out reactive wet spinning. The orthosilicic acid / potassium silicate fiber formed in the coagulation bath was wound at a winding 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 SiO 2 Porous fibers. Occasionally, there is a phenomenon of broken filaments during the spinning process. Prepared SiO 2 The specific surface area of ​​porous fibers is 350.2m 2 / g, the most probable pore diameter is 11nm, and 51...

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Abstract

The invention relates to a method for preparing high-specific-surface-area continuous SiO2 porous fiber through a natural drying method. The method includes the steps of preparing a spinning solution from silicate or silanol sol, adding the spinning solution to an acid solution coagulating bath, conducting reaction and wet spinning to obtain orthosilicic acid / silicate fiber, winding the orthosilicic acid / silicate fiber, ageing the orthosilicic acid / silicate fiber at the normal temperature, washing the orthosilicic acid / silicate fiber with deionized water to be neutral, conducting solvent replacement through ethyl alcohol, and conducting natural drying. The method has the advantages that devices are simple, raw materials are low in price and easy to obtain, the reaction process is simple and spinnability is good, the problem that inorganic porous fiber can hardly be spun into fiber is solved, and meanwhile drying of the porous fiber is achieved through natural drying. The prepared SiO2 porous fiber has abundant pores, an ultrahigh specific surface area, high temperature resistance and chemical corrosion resistance, the specific surface area of the fiber can be adjusted, and the method can be used for the fields of catalyst carriers, adsorption filtration and the like.

Description

technical field [0001] The invention belongs to the field of preparation of porous fibers, in particular to a natural drying method for preparing continuous SiO with high specific surface area 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08
CPCD01F9/08
Inventor 朱美芳孟思陈文萍江晓泽
Owner DONGHUA UNIV
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