Method for preparing SiO2-cellulose composite aerogel material with one-pot method

A composite airgel and cellulose technology, which is applied in the field of preparing SiO2-cellulose composite airgel materials by a one-pot method, can solve the problems of porosity reduction, blocking pore openings, cellulose phase separation, etc., and achieves practical results. Effective, simple process, and the effect of inhibiting phase separation

Active Publication Date: 2017-06-20
NANJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] Conventional SiO 2 - Cellulose composite aerogels are usually impregnated with wet cellulose membranes into tetraethyl orthosilicate/methyl orthosilicate, silica airgel is formed in the micropores of the cellulose matrix, and then 2 Medium drying, etc., however, this method will quickly gel the silica on the outer surface of the cellulose, thereby blocking the pore openings and hinde

Method used

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  • Method for preparing SiO2-cellulose composite aerogel material with one-pot method
  • Method for preparing SiO2-cellulose composite aerogel material with one-pot method
  • Method for preparing SiO2-cellulose composite aerogel material with one-pot method

Examples

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example 1

[0036] 1. Stir and disperse 2g of microcrystalline cellulose into alkali urea solution (4.0gLiOH / 10gUrea / 84gH 2 O), after dispersing, transfer to the refrigerator to pre-cool at -5°C, and immediately use the motor to stir at 2000 rpm for 4 minutes to dissolve the cellulose to obtain a viscous solution, and then immediately centrifuge at 8000 rpm for 10 minutes to remove bubbles Obtain a clear and transparent cellulose solution with a solvent mass fraction of 2%; weigh 16.3g of Na 2 SiO 3 ·9H 2 O was dissolved in 83.7g of distilled water with magnetic stirring to obtain a 7% sodium silicate aqueous solution. The cellulose solution and sodium silicate solution were mechanically stirred and mixed at a volume ratio of 10:1, and then ultrasonically oscillated to remove bubbles to form a uniform solution. Mixed sodium silicate-cellulose mixed solution. Then, the uniformly mixed sodium silicate-cellulose mixed solution is poured into the mold and placed in a methanol coagulation bath f...

example 2

[0038] Stir and disperse 6g cotton pulp cypress cellulose into alkali urea solution (4gLiOH / 10gThiourea / 80gH 2 O), transfer to the refrigerator to pre-cool at -20°C after dispersing, immediately use the motor to stir for 4 minutes at 2000 rpm to dissolve the cellulose to obtain a viscous solution, and then immediately centrifuge at 10000 rpm for 5 minutes to remove bubbles Obtain a clear and transparent cellulose solution with a solvent mass fraction of 6%; weigh 1.74g of Na 2 SiO 3 ·5H 2 O is dissolved in 98.3g of distilled water with magnetic stirring to obtain a 1% sodium silicate aqueous solution. The cellulose solution and sodium silicate solution are mechanically stirred and mixed in a volume ratio of 1:1, and the bubbles are removed by ultrasonic vibration to form a uniform mixture. The sodium silicate-cellulose mixed solution. Then, the uniformly mixed sodium silicate-cellulose mixed solution is poured into the mold and placed in an ethanol coagulation bath for regenerat...

example 3

[0040] Stir and disperse 3g of linter cotton cellulose into alkali urea solution (of which 4.6gNaOH / 15gUrea / 77.4gH 2 O), transfer to the refrigerator to pre-cool at -15°C after dispersing, immediately use the motor to stir for 12 minutes at 1000 rpm to dissolve the cellulose to obtain a viscous solution, and then immediately centrifuge at 8000 rpm for 10 minutes to remove bubbles Obtain a clear and transparent cellulose solution with a solvent mass fraction of about 3%; weigh 3g of anhydrous Na 2 SiO 3 Dissolve into 97ml of distilled water with magnetic stirring to obtain a 3% sodium silicate aqueous solution. The cellulose solution and sodium silicate solution are mechanically stirred and mixed in a volume ratio of 2:1, and the bubbles are removed by ultrasonic vibration. Uniformly mixed sodium silicate-cellulose mixed solution. Then pour the uniformly mixed sodium silicate-cellulose mixed solution into a mold and place it in an acetone coagulation bath for regeneration. After ...

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Abstract

The invention relates to a method for preparing a SiO2-cellulose composite aerogel material with a one-pot method. The method comprises the following steps: taking cellulose as a raw material and dissolving the cellulose with a green alkaluria solvent; taking organic sodium silicate as a silicon source, and stirring and dispersing to obtain a uniformly mixed aqueous solution of the cellulose and the sodium silicate; combining a sol-gel method to obtain regenerated cellulose wet gel containing a silicon source; taking cellulose gel as a framework and taking inorganic acid as a reaction solvent, and inducing to generate SiO2; finally, drying through a CO2 supercritical drying process to obtain the SiO2-cellulose organic-inorganic composite aerogel. The method has the advantages that the process is simple and rapid, has high feasibility and is green and environment-friendly; the problems in an in-situ immersion method that the SiO2 has poor dispersity, low complex content, poor complex stability and the like in a cellulose porous network structure are effectively solved; the prepared inorganic-organic composite aerogel has relatively low coefficient of heat conductivity and good heat insulation performance and has good application prospect in the aspects of low-temperature cold insulation materials, middle-temperature and low-temperature heat insulation and heat preservation materials and adsorption materials.

Description

Technical field [0001] The invention belongs to the field of preparing polymer nano-functional materials, and relates to a one-pot method for preparing SiO 2 -Method of cellulose composite aerogel material. Background technique [0002] Cellulose aerogel is a new type of new natural biomass material developed in recent years. Cellulose is the largest green and renewable resource on earth. Cellulose aerogel has both the characteristics of renewable natural polymer and the many advantages of traditional high-porosity nano-inorganic porous materials. Compared with poor strength and fragile silicon aerogel Glue has the characteristics of good toughness and easy processing. Therefore, cellulose aerogel has become a new material with broad application prospects and high development value. It is used in the control of drug release stents, gas absorbents, thermal insulation materials and pyrolysis. Electrode materials for carbon batteries and fuel cells have great potential. [0003] Cel...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/075C08L1/02C08K3/36
CPCC08J3/075C08J9/28C08J2201/0502C08J2205/026C08J2301/02C08K3/36C08L1/02
Inventor 崔升张鑫王凯阳林本兰沈晓冬
Owner NANJING UNIV OF TECH
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