Preparation method of ductile SiO2 aerogel fiber coated with PVP (polyvinylpyrrolidone)

An airgel and fiber technology, applied in fiber treatment, fiber chemical characteristics, wet spinning, etc., to achieve the effect of cheap and easy to obtain raw materials, simple reaction process, and expanded application range

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

[0006] A kind of ductile SiO2 coated with PVP 2 The literature of airgel fiber has not been reported yet

Method used

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  • Preparation method of ductile SiO2 aerogel fiber coated with PVP (polyvinylpyrrolidone)
  • Preparation method of ductile SiO2 aerogel fiber coated with PVP (polyvinylpyrrolidone)
  • Preparation method of ductile SiO2 aerogel fiber coated with PVP (polyvinylpyrrolidone)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 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. Solvent replacement was performed with ethanol and dried at normal temperature. After drying, immerse the fiber in 10wt% PVP aqueous solution for 5 minutes, take it out, and repeat the immersion in PVP and drying operations 5 times. Finally, after freeze-drying, a kind of tough SiO coated with PVP is obtained. 2 Airgel fibers. ...

Embodiment 2

[0035] 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. Solvent replacement was performed with ethanol and dried at normal temperature. After drying, immerse the fiber in 5wt% PVP aqueous solution for 5 minutes, take it out, and repeat the immersion in PVP and drying operations 4 times. Finally, after freeze-drying, the tough SiO coated with PVP was obtained. 2 Airgel fibers...

Embodiment 3

[0037] 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. Solvent replacement was performed with ethanol and dried at normal temperature. After drying, immerse the fiber in 15wt% PVP aqueous solution for 5 minutes, take it out, and repeat the immersion in PVP and drying operation 3 times. Finally, after freeze-drying, the tough SiO coated with PVP was obtained. 2 Airgel fibers. Prepared du...

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Abstract

The invention relates to a preparation method of a ductile SiO2 aerogel fiber coated with PVP (polyvinylpyrrolidone). The preparation method comprises the following steps: a spinning solution is prepared from silicate or silanol sol; an acid solution is added to a coagulating basin to serve as a coagulating bath; the spinning solution is added to the coagulating bath for reaction wet spinning, an orthosilicic acid / silicate fiber is obtained and is subjected to winding, aging and washing to be neutral, and solvent exchange and drying performed; the dried fiber is soaked in a PVP aqueous solution, taken out and dried, and a product is obtained. The preparation method has the characteristics of cheap and available raw materials, simple reaction process and good spinnability; the prepared inorganic SiO2 aerogel fiber has rich pores, high specific surface area, high-temperature resistance and chemical corrosion resistance, meanwhile, the specific surface area of the fiber is adjustable, the fiber has certain toughness, the application range of the aerogel fiber can be expanded, and the aerogel fiber has higher practical value.

Description

technical field [0001] The invention belongs to the field of airgel fibers and their preparation, in particular to a PVP-coated tough 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F11/00D01F9/08D01F9/10D06M15/356D01D5/06
CPCD01D5/06D01F9/08D01F9/10D01F11/00D06M15/3562
Inventor 朱美芳孟思舒鑫周哲
Owner DONGHUA UNIV
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