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A method for post-loading SiO2 to prepare continuous cellulose/SiO2 airgel fibers with high specific surface area

A high specific surface area, cellulose technology, applied in the direction of artificial filament, plant fiber, fiber treatment, etc. in cellulose solution, to achieve the effect of good flexibility, rich specific surface area, and adjustable specific surface area

Active Publication Date: 2018-10-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently about afterload SiO 2 Preparation of High Specific Surface Area Continuous Cellulose / SiO 2 The method of airgel fiber has not been reported yet

Method used

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  • A method for post-loading SiO2 to prepare continuous cellulose/SiO2 airgel fibers with high specific surface area
  • A method for post-loading SiO2 to prepare continuous cellulose/SiO2 airgel fibers with high specific surface area
  • A method for post-loading SiO2 to prepare continuous cellulose/SiO2 airgel fibers with high specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Bacterial cellulose (Hainan Yide Food Co., Ltd., crushed compressed coconut) is dispersed in a low-temperature solvent system with a mass fraction of 7% NaOH / 8% urea / 10% thiourea, wherein the mass fraction of bacterial cellulose is 2% (All percentages include itself, the same below), mechanically vigorously stirred for 30 minutes, degassed with a centrifuge at 10,000r / min for 20 minutes to obtain a spinning stock solution, and extruded the spinning stock solution into a coagulation bath for wet processing at normal temperature and pressure. Spinning to obtain cellulose gel fibers; the coagulation bath is a 10% ethanol aqueous solution; the extrusion speed of the spinning stock solution is 0.6m / min; the cellulose gel fibers are placed in the coagulation bath After winding at a winding speed of 0.6m / min, soak in aging liquid ethanol and age at room temperature for 1h to make it completely gelled; after aging, wash the fiber with deionized water until neutral, Immerse the ob...

Embodiment 2

[0033] Disperse the treated cotton pulp cellulose in a low-temperature solvent system with a mass fraction of 8% NaOH / 8% urea / 6.5% thiourea, wherein the mass fraction of cotton pulp cellulose is 7%, stir mechanically for 30min, and use a centrifuge 10000r / min carries out defoaming treatment for 20min to obtain the spinning dope, extrudes the spinning dope into a coagulation bath under normal temperature and pressure to carry out wet spinning to obtain cellulose gel fiber; the coagulation bath has a volume fraction of 50 % ethanol aqueous solution; the extrusion speed of the spinning stock solution is 3m / min; after the cellulose gel fiber is wound with a winding speed of 6m / min in the coagulation bath, it is immersed in the aging liquid ethanol Aging at room temperature for 1 hour to make it completely gelled; after aging, wash the fiber with deionized water until neutral, immerse in sodium silicate nonahydrate sol, stir for 30 minutes, remove the surface sol after taking it out...

Embodiment 3

[0035] Disperse bacterial cellulose in a low-temperature solvent system with a mass fraction of 9.5% NaOH / 4.5% thiourea, wherein the mass fraction of bacterial cellulose is 7%, stir mechanically for 30 minutes, and perform defoaming treatment with a centrifuge at 10,000r / min for 20 minutes to obtain Spinning stock solution, extruding the spinning stock solution into a coagulation bath at normal temperature and pressure for wet spinning to obtain cellulose gel fibers; the coagulation bath is an acetone aqueous solution with a volume fraction of 10%; the spinning The extrusion speed of the silk stock solution is 2.4m / min; after winding the cellulose gel fiber in the coagulation bath with a winding speed of 6m / min, it is immersed in the aging liquid acetone and aged at room temperature for 20min to make it Complete gelation; after aging, wash the fiber with deionized water to neutrality, then immerse in potassium water glass sol, stir for 30 minutes, remove the surface sol after t...

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Abstract

The invention discloses a method for preparing continuous cellulose / SiO2 aerogel fibers with high specific surface area by back loaded SiO2. The method includes the steps: preparing cellulose into spinning solution; adding acid solution, ethanol solution or acetone solution into a coagulating tank to serve as coagulating bath; adding the spinning solution into the coagulating bath for wet spinning to obtain the cellulose aerogel fibers; winding the obtained cellulose aerogel fibers, immersing the cellulose aerogel fibers in aging solution for normal-temperature aging for 15 minutes to 1 hour, washing the cellulose aerogel fibers to be neutral with deionized water, immersing the cellulose aerogel fibers in silicate or silanol sol, taking out the cellulose aerogel fibers, removing surface sol, immersing the cellulose aerogel fibers in the aging solution for normal-temperature aging for 2-10 days, washing the cellulose aerogel fibers to be neutral with the deionized water, replacing solvents and drying the solution to obtain the continuous cellulose / SiO2 aerogel fibers. The prepared continuous cellulose / SiO2 aerogel fibers have ultrahigh specific surface area and rich hierarchical pores, and fiber pore diameters and the specific surface area can be adjusted.

Description

technical field [0001] The invention belongs to the field of preparation of airgel fibers, in particular to a back-loaded SiO 2 Preparation of High Specific Surface Area Continuous Cellulose / SiO 2 The airgel fiber approach. Background technique [0002] Aerogel is a highly porous solid filled with gas (usually air) in the pores and network structure of the solid matrix. Because of a series of excellent properties such as high porosity, low density, low thermal conductivity, low sound velocity, low refractive index and large specific surface area, aerogels have broad application prospects in many fields. Aerogels are divided into inorganic aerogels and organic aerogels. Compared with fragile inorganic aerogels, organic aerogels have better mechanical properties and good flexibility. However, inorganic aerogels, especially silica (SiO 2 ) airgel has a very high specific surface area (200~1000m 2 / g), so combining the toughness of organic aerogels and the ultra-high specif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F2/02D01D1/02D01D5/06D06M11/46
CPCD01D1/02D01D5/06D01F2/02D06M11/46D06M2101/06
Inventor 朱美芳张君妍陈文萍周哲孟思
Owner DONGHUA UNIV
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