A kind of preparation method of sio2/cellulose tough aerogel fiber
A technology of airgel fiber and cellulose, applied in the direction of artificial filament in cellulose solution, wet spinning method, etc.
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Embodiment 1
[0033] Use composite solvent 9wt% NaOH / 5wt% thiourea / 5wt% urea to prepare microcrystalline cellulose solution as cellulose solvent, cellulose solution and modulus are 2, the sodium water glass of 50 degrees Baume is mixed, cellulose solution The volume ratio with sodium water glass is 1:9. The mixed solution is used as spinning dope, with H 2 SO 4 / Na 2 SO 4 Solution (concentration of sulfuric acid solution is 0.8mol / L, Na 2 SO 4 The concentration is 0.8mol / L) as a coagulation bath for reactive wet spinning. The orthosilicic acid / silicate / cellulose fibers formed in the coagulation bath were wound at a winding speed of 0.1 m / s. The wound fiber is immersed in H 2 SO 4 / Na 2 SO 4 Solution (concentration of sulfuric acid solution is 0.01mol / L, Na 2 SO 4 The concentration is 0.8mol / L) for 10 days for aging to realize the transformation from orthosilicic acid / silicate fiber to SiO 2 The fiber is transformed, and the cellulose is further solidified at the same time, and ...
Embodiment 2
[0035] Use composite solvent 9wt% NaOH / 5wt% thiourea / 5wt% urea as cellulose solvent to prepare microcrystalline cellulose solution, cellulose solution is mixed with solution obtained by direct heating of sodium silicate nonahydrate, cellulose solution and silicic acid The volume ratio of sodium solution is 5:5. The mixed solution is used as spinning dope, with H 2 SO 4 / Na 2 SO 4 Solution (concentration of sulfuric acid solution is 0.8mol / L, Na 2 SO 4 The concentration is 0.8mol / L) as a coagulation bath for reactive wet spinning. The orthosilicic acid / silicate / cellulose fibers formed in the coagulation bath were wound at a winding speed of 2 m / s. The wound fiber is immersed in H 2 SO 4 / Na 2 SO 4 solution (concentration of sulfuric acid solution is 0.01mol / L, Na 2 SO 4 The concentration is 0.8mol / L) for 2 days for aging to realize the transformation from orthosilicic acid / silicate fiber to SiO 2 The fiber is transformed, and the cellulose is further solidified at ...
Embodiment 3
[0037] Use composite solvent 9wt% NaOH / 5wt% thiourea / 5wt% urea to prepare microcrystalline cellulose solution as cellulose solvent, the cellulose solution is mixed with the potassium water glass that modulus is 23,35 Baume degree, cellulose solution The volume ratio to potassium water glass is 6:4. The mixed solution is used as spinning dope, with H 2 SO 4 / Na 2 SO 4 Solution (concentration of sulfuric acid solution is 0.8mol / L, Na 2 SO 4 The concentration is 0.8mol / L) as a coagulation bath for reactive wet spinning. The orthosilicic acid / silicate / cellulose fibers formed in the coagulation bath were wound at a winding speed of 0.5 m / s. The wound fiber is immersed in H 2 SO 4 / Na 2 SO 4 Solution (concentration of sulfuric acid solution is 0.01mol / L, Na 2 SO 4 The concentration is 0.8mol / L) for 10 days for aging to realize the transformation from orthosilicic acid / silicate fiber to SiO 2 The fiber is transformed, and the cellulose is further solidified at the same t...
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