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A kind of preparation method of continuous sio2 airgel fiber

An aerogel and fiber technology, which is applied in chemical instruments and methods, wet spinning, rayon of inorganic raw materials, etc., can solve the problems of unreported aerogel fibers, achieve good spinnability, cheap raw materials, The effect of easy availability of raw materials

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

[0005] The current literature reports the preparation of SiO 2 The method of airgel fiber has not been reported yet

Method used

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  • A kind of preparation method of continuous sio2 airgel fiber
  • A kind of preparation method of continuous sio2 airgel fiber
  • A kind of preparation method of continuous sio2 airgel fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Sodium water glass with a modulus of 2 and 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 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 deionized water to replace the solution in the fiber, and freeze-dry to obtain SiO 2 Airgel fibers. The spinning process is very smooth and continuous. Prepared SiO 2 Airgel fiber specific surface area is 565.8m 2 / g, the most probable pore diameter is 10nm. 64% of the maximum adsorption capacity of methylene blue can be ...

Embodiment 2

[0034] 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 deionized water to replace the solution in the fiber, and freeze-dry to obtain SiO 2 Airgel fibers. Occasionally, there is a phenomenon of broken filaments during the spinning process. Prepared SiO 2 Airgel fiber specific surface area is 421.6m 2 / g, the most probable pore diameter is 10nm. 59% of the maximum ads...

Embodiment 3

[0036] Potassium water glass with a modulus of 3 and 35 degrees Baume was used as the spinning stock solution, and 0.8 mol / 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 deionized water to replace the solution in the fiber, and freeze-dry to obtain SiO 2 Airgel fibers. Occasionally, there is a phenomenon of broken filaments during the spinning process. Prepared SiO 2 Airgel fiber specific surface area is 435.4m 2 / g, the most probable pore diameter is 11nm. It takes 5 minutes to reach 60% of t...

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Abstract

The invention relates to a preparation method of continuous SiO2 aerogel fibers. The method comprises the following steps: processing silicate or silanol sol to prepare a spinning stock solution; adding an acidic solution to a coagulation tank to form a coagulation bath; and injecting the spinning stock solution to the coagulation bath, carrying out reaction wet spinning to obtain orthosilicic acid / silicate fibers, reeling the orthosilicic acid / silicate fibers, immersing the reeled fibers in an ageing solution, ageing the immersed fibers at normal temperature for 2-10d, washing the aged fibers with deionized water until the aged fibers are neutral, carrying out solvent displacement, and drying the obtained fibers to obtain the continuous SiO2 aerogel fibers. The method has the characteristics of cheap and easily available raw materials, simple reaction process and good spinnability, and solves the problem of difficult production of fibers through spinning SiO2 aerogel. The inorganic SiO2 aerogel fibers prepared in the invention have the characteristics of abundant holes, high specific surface area, high temperature resistance, chemical corrosion resistance and adjustable specific surface area, and can be applied in the fields of catalyst carriers and adsorbing filtration.

Description

technical field [0001] The invention belongs to the field of preparation of airgel fibers, in particular to a continuous SiO 2 Preparation method of airgel fiber. Background technique [0002] Aerogel (aerogel) refers to the medium filled in the space network structure in the gel is not a solvent but a gas, a special gel with a solid appearance, because there is almost no solvent component inside, so it is also called xerogel . Airgel is a low-density nanoporous amorphous solid material with a unique structure. The solid phase forms a spatial network structure, and the network structure and the pore structure between the networks are at the nanoscale. Because of its unique structure, airgel also has many unique properties, such as high porosity, high specific surface area, strong adsorption, low density, low acoustic impedance, low thermal conductivity, low refraction, etc. [0003] SiO 2 The high specific surface area of ​​airgel can provide a large number of reaction / i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F9/08C01B33/154C01B33/158D01D5/06
CPCC01B33/154C01B33/1585D01D5/06D01F9/08
Inventor 朱美芳孟思陆秋旭江晓泽
Owner DONGHUA UNIV
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