Preparation method of multifunctional cellulose elastic aerogel

A cellulose gel and cellulose technology, which is applied in the preparation of cellulose airgel and the field of preparation of multifunctional cellulose elastic airgel, can solve the problem of complex preparation methods, low mechanical strength, and no Elasticity and other issues, to achieve the effect of expanding the application range, excellent magnetic properties, and reducing density

Active Publication Date: 2016-05-11
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of multifunctional cellulose elastic airgel to solve the problems of existing cellulose airgel inelasticity, low mechanical strength and complicated preparation methods

Method used

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  • Preparation method of multifunctional cellulose elastic aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 10g of sugarcane waste residue, add 1L of deionized water to soak, crush and mechanically stir for 3h to make a 0.01g / mL cellulose suspension; take 300mL of cellulose suspension, put it in a 500mL round bottom flask, add 4g of Sodium chlorate and 1.2mL acetic acid were mechanically stirred at 75°C for 3 hours for pretreatment, washed with deionized water to obtain a modified cellulose suspension; then dispersed in ethanol, vacuum-filtered and formed, at 60°C Dry to form a cellulose gel; finally the cellulose gel is placed in N 2 Carbonization at 800°C for 4 hours under atmosphere to obtain multifunctional elastic cellulose airgel. The properties are shown in Table 1.

Embodiment 2

[0021] Weigh 7g of cotton fiber, crush it, put it in a 500mL round bottom flask, add 400mL of deionized water, 1g of sodium chlorite and 0.3mL of acetic acid, mechanically stir at 80°C for 2.5h for pretreatment, and wash with deionized water clean to obtain a modified cellulose suspension; then disperse it in acetone, form it by vacuum suction filtration, and dry at 60°C to form a cellulose gel; finally, the cellulose gel is placed in N 2 Carbonization at 1000°C for 3 hours under atmosphere to obtain multifunctional elastic cellulose airgel. The properties are shown in Table 1.

Embodiment 3

[0023] Weigh 20 g of nanocellulose, add 400 mL of deionized water, and stir mechanically for 2 h to prepare a 0.05 g / mL purified cellulose suspension; weigh 0.4 g Fe 3 o 4 Nanoparticles were added to a 250mL polytetrafluorothermal tank; 120mL of purified cellulose suspension was added to a polytetrafluorohydrothermal tank, magnetically stirred for 10min, ultrasonicated for 30min, and reacted at 160°C for 8h to obtain cellulose / Fe3iron tetroxide nanocomposite suspension; then it was dispersed in acetone, formed by suction filtration, and dried at 60°C to form a cellulose / ferric oxide nanocomposite gel; finally the composite gel was placed in N 2 Carbonization at 800°C for 2 hours under atmosphere to obtain multifunctional elastic cellulose airgel. The properties are shown in Table 1.

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Abstract

The invention discloses a preparation method of a multifunctional cellulose elastic aerogel, belonging to the field of aerogel materials. The preparation method comprises the following steps: dispersing cellulose in water, carrying out pretreatment by adding sodium chlorite or / and in a solvothermal way, and cleaning with deionized water to obtain a purified cellulose dispersion solution; adding a modifier to perform chemical modification, thereby obtaining a modified cellulose suspension; dispersing the modified cellulose suspension in an organic solvent, forming, drying to form a modified cellulose gel, and finally, carrying out heat treatment on the modified cellulose gel to obtain the multifunctional cellulose elastic aerogel. The cellulose is subjected to pretreatment and chemical modification, thereby lowering the density of the aerogel, greatly enhancing the elasticity and mechanical strength of the aerogel, endowing the aerogel with excellent magnetism, electric conductivity, superhydrophobicity, superoleophobicity and many other functions, and widening the application range of the traditional cellulose aerogel.

Description

technical field [0001] The invention relates to the preparation of a cellulose aerogel, in particular to a preparation method of a multifunctional cellulose elastic aerogel, which belongs to the field of airgel materials. Background technique [0002] Cellulose is a renewable, degradable, green and environmentally friendly natural polysaccharide macromolecule that exists in nature, and is widely used in food, construction, textiles and other fields. As a three-dimensional porous material, cellulose airgel has its own excellent characteristics while retaining the performance of traditional airgel. Therefore, cellulose aerogels have received extensive attention. In patent CN103205015B, cellulose is dissolved and defoamed with ionic liquid as solvent, then regenerated in ionic liquid aqueous solution or ionic liquid alcohol solution coagulation bath, replaced by solvent, and then obtained by supercritical drying to obtain cellulose airgel. In patent CN201410354796, cellulose ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/24
CPCC08J3/24C08J9/28C08J2301/02
Inventor 张俊平李凌霄李步成
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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