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Cellulose and nanometer titania composite material, preparation and use thereof

A technology of nano-titanium dioxide and composite materials, applied in the field of material science, can solve the problems of difficult melting and dissolution processing, rare and other problems, and achieve the effect of improving whiteness, convenient operation and simple process

Inactive Publication Date: 2005-05-11
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few research reports on cellulose / nanoparticle composite films and fibers, mainly because cellulose has strong intramolecular and intermolecular hydrogen bonds, making it difficult to melt and dissolve.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 200g of a mixed solution containing 7.5wt% NaOH and 11wt% urea in a 250mL beaker, then add anatase nano-TiO under magnetic stirring 2 Powder (average particle size 16 nanometers), after stirring for about 12 hours, place the solution in a refrigerator to cool down to about -12°C; weigh the torn cotton linter pulp (molecular weight is 10.3×10 4 ) 8.2g was added therein, and mechanically stirred until the linter pulp was completely dissolved. The solution thus obtained was centrifuged at about 10°C and 10,000rpm for 20 minutes to remove the nano-TiO 2 The small amount of gel formed was agglomerated and degassed. The solution obtained after centrifugation is poured on a clean glass plate and scraped with a glass rod to form a film. The thickness of the film is controlled by a thin copper wire to 0.5mm, and then the prepared film is immersed in 2000mL of 5.6wt% sulfuric acid coagulation solution to coagulate for 5 minutes , the obtained composite film was washed wit...

Embodiment 2

[0017] Weigh 200g of a mixed solution containing 7.5wt% NaOH and 11wt% urea in a 250mL beaker, then add rutile nano-TiO under magnetic stirring 2 Powder (average particle size 25 nanometers), after stirring for about 12 hours, place the solution in a refrigerator to cool down to about -12°C; weigh the torn cotton linter pulp (molecular weight is 10.3×10 4 ) 8.2g was added therein, and mechanically stirred until the linter pulp was completely dissolved. The solution thus obtained was centrifuged at about 10°C and 10,000rpm for 20 minutes to remove the nano-TiO 2 The small amount of gel formed was agglomerated and degassed. The solution obtained after centrifugation is poured on a clean glass plate and scraped with a glass rod to form a film. The thickness of the film is controlled by a thin copper wire to 0.5mm, and then the prepared film is immersed in 2000mL of 5.6wt% sulfuric acid coagulation solution to coagulate for 5 minutes , the obtained composite film was washed with...

Embodiment 3

[0019] Take by weighing 200g the mixed solution that contains 7.5wt%NaOH and 11wt% urea in a 250mL beaker, add 0.5g rutile type (or anatase type) nano TiO2 under magnetic stirring then 2 powder (average particle size 60 nanometers), after stirring for about 12 hours, place the solution in a refrigerator to cool down to about -12°C; weigh the torn cellulose (molecular weight is 4.6×10 4 ) 12g was added therein, and mechanically stirred until the cellulose was completely dissolved. The solution thus obtained was centrifuged at about 10°C and 10,000rpm for 20 minutes to remove the nano-TiO 2 The small amount of gel formed was agglomerated and degassed. The solution obtained after centrifugation is poured on a clean glass plate and scraped with a glass rod to form a film. The thickness of the film is controlled by a thin copper wire to 0.5mm, and then the prepared film is immersed in 2000mL of 5.6wt% sulfuric acid coagulation solution to coagulate for 5 minutes , the obtained co...

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Abstract

The composite of the cellulose and the nanometer titanium oxide and its preparation method and use are disclosed. It is produced by: making the suspending liquid by dispersing the nanometer titanium oxide particle into the 7-8% NaOH and 10-13% urea(wt%), adding in the cellulose after cooling it down to -8--15deg.C , stirring at the room temperature, scraping pellicle and spraying filament after filtering and degassing, solidifying and revivifying in the coagulator. It features: the intensity, the braking extensibility, flexibility of the pellicle and filament of the regenerated cellulous remains in the cellulose and the nanometer titanium oxide, endowed the new functions such as antisepsis activity and absorption of the ultraviolet ray. Its advantages include: easy process, no pollution of dissolvent, convenient operation, low cost, and high intensity of the composite.

Description

technical field [0001] The invention relates to a composite material of cellulose and nano-titanium dioxide, a preparation method and application thereof, and belongs to the field of natural polymer chemistry and also belongs to the field of material science. Background technique [0002] In recent years, polymer / nanoparticle composites have become an extremely attractive field of modern materials science. (M. J. Maclachian, I. Manners, G. A. Ozin, Adv. Mater., 2000, 12, 675). Due to the small size of nanoparticles, there are small size effects, surface effects, quantum size effects and macroscopic quantum tunneling effects that general macroscopic objects do not have, as well as high air absorption, high mixing, and low density, so that polymer / nano Particle composites have many excellent properties different from conventional solids, such as mechanics (E.P.Giannelis, Adv.Mater., 1996, 8, 29), optics (O.Wilson, G.J.Wilson, P.Mulvaney, Adv.Mater., 2002 , 14, 1000), heat (Y...

Claims

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Application Information

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IPC IPC(8): A61L31/04C08K3/22C08L1/02
Inventor 周金平张俐娜刘石林戚佳宁
Owner WUHAN UNIV
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