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Preparation method of cellulose aerogels ball with controllable diameters

An aerogel ball and cellulose technology, which is applied in the field of preparation of cellulose aerogel balls, can solve the problem that the diameter of cellulose aerogel balls cannot be effectively controlled, the application range of cellulose aerogel balls is limited, and the disadvantages are great. Large-scale production application and other issues, to achieve the effect of improving application value, reducing preparation cost, and uniform size

Inactive Publication Date: 2019-08-06
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the diameter of cellulose airgel spheres prepared by the above method cannot be effectively controlled, and the size distribution is not uniform, which severely limits the application range of cellulose airgel spheres.
Moreover, these methods for preparing cellulose airgel spheres are mostly methods such as manually pushing syringes, manual dripping with rubber droppers, spray drying, supercritical drying, etc., which may have defects such as low preparation efficiency or high cost, which are not conducive to mass production applications

Method used

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  • Preparation method of cellulose aerogels ball with controllable diameters
  • Preparation method of cellulose aerogels ball with controllable diameters
  • Preparation method of cellulose aerogels ball with controllable diameters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Preparation of cellulose solution:

[0042] Add 7g of NaOH and 12g of urea into 81g of cellulose powder aqueous suspension with a solid content of 1.2%, refrigerate at -8°C for 4 hours, take it out, and stir at room temperature until the cellulose powder dissolves into a transparent and viscous cellulose solution;

[0043] 2) Preparation of acidic coagulation bath:

[0044] Mix 100ml of ethyl acetate and 30ml of acetic acid, and stir evenly, as an acidic coagulation bath for later use;

[0045] 3) Preparation of cellulose gel balls:

[0046] The cellulose solution prepared in step 1) is transferred to the cylinder cavity of the dispensing needle of the dispensing device, and the needle of the dispensing needle is fixed on the iron stand, located at 2 cm above the acidic coagulation bath prepared in step 2), Specifically, the dispensing device includes a dispensing machine, a dispensing needle, and an air pump. The dispensing machine is used as a pressure controller...

Embodiment 2

[0050] 1) Preparation of cellulose solution:

[0051] Add 7g of NaOH and 12g of urea into 81g of cellulose powder aqueous suspension with a solid content of 2%, refrigerate at -8°C for 6 hours, take it out, and stir at room temperature until the cellulose powder dissolves into a transparent and viscous cellulose solution;

[0052] 2) Preparation of acidic coagulation bath:

[0053] Mix 100ml of ethyl acetate and 30ml of hydrochloric acid with a mass fraction of 15%, and stir evenly, and use it as an acidic coagulation bath for subsequent use;

[0054] 3) Preparation of cellulose gel balls:

[0055] The cellulose solution prepared in step 1) is transferred to the cylinder cavity of the dispensing needle of the dispensing device, and the needle of the dispensing needle is fixed on the iron stand, located at 5 cm above the acidic coagulation bath prepared in step 2), Specifically, the dispensing device includes a dispensing machine, a dispensing needle, and an air pump. The dis...

Embodiment 3

[0059] 1) Preparation of cellulose solution:

[0060] Add 7g of NaOH and 12g of urea into 81g of cellulose powder aqueous suspension with a solid content of 2.5%, refrigerate at -8°C for 8 hours, take it out, and stir at room temperature until the cellulose powder dissolves into a transparent and viscous cellulose solution;

[0061] 2) Preparation of acidic coagulation bath:

[0062] Mix 100ml of ethyl acetate and 30ml of sulfuric acid with a mass fraction of 10%, and stir evenly, and use it as an acidic coagulation bath for subsequent use;

[0063] 3) Preparation of cellulose gel balls:

[0064] The cellulose solution prepared in step 1) is transferred to the cylinder cavity of the dispensing needle of the dispensing device, and the needle of the dispensing needle is fixed on the iron stand, located at 5 cm above the acidic coagulation bath prepared in step 2), Specifically, the dispensing device includes a dispensing machine, a dispensing needle, and an air pump. The dispe...

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Abstract

A preparation method of cellulose aerogel balls with a controllable diameters comprises the following steps: 1) dissolving cellulose powder in a NaOH / urea system to obtain a cellulose solution; 2) mixing a certain proportion of chloroform and an acid or mixing ethyl acetate and the acid to obtain an acidic coagulation bath, and stirring to uniformly mix the coagulation bath; (3) transferring the cellulose solution into a dispensing syringe to enable the cellulose solution to fall into the stirred coagulation bath through a special nozzle under different pressures to obtain cellulose gel ballswith different diameters; 4) filtering the cellulose gel balls by suction, replacing the solvent and drying to obtain the cellulose aerogel balls. The cellulose aerogel balls prepared by the preparation method are nearly perfect spherical, have controllable diameters and uniform sizes, can greatly expand the application range of the cellulose aerogel, and have high preparation efficiency and cheapexperimental equipment. The particle sizes of cellulose aerogel balls can be adjusted within the range of 5 mu m to 2 mm, and cross-linked pores are mesopores and micropores.

Description

technical field [0001] The invention relates to the application field of cellulose, in particular to a preparation method of cellulose airgel balls with controllable diameter. Background technique [0002] Cellulose is abundant and renewable in nature, and is an inexhaustible green polymer material. Cellulose aerogels have the characteristics of high specific surface area, high porosity, and low thermal conductivity, which make them have broad application prospects in the fields of composite materials, adsorption, heat insulation, optoelectronics, and biomedicine. At present, the methods of preparing cellulose airgel balls include dissolution regeneration method (Wang Xiaoyu, Zhang Yang, Jiang Hua. Preparation of nano-cellulose airgel by tert-butanol freeze-drying method[J]. Journal of Forestry Engineering, 2017, 2(1) :103-107.), supercritical drying method (Zhang Yan, Chen Lan, Li Baoguo, etc. Supercritical CO 2 Anti-solvent method to prepare ethyl cellulose microspheres ...

Claims

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Application Information

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IPC IPC(8): C08J3/16C08J3/24C08L1/02
CPCC08J3/16C08J3/24C08J2301/02
Inventor 邵自强边红莉周逸王行惠王丙男王飞俊王文俊王建全
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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