Preparation method of magnetic cellulose aerogel

A technology of cellulose aerogel and cellulose solution, applied in the field of preparing magnetic cellulose aerogel, can solve the problems of limited quantity, uneven distribution, aggregation of composite material particles, etc., to achieve stable product performance, improve adhesion strength, The effect of strong adsorption capacity

Active Publication Date: 2018-01-12
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

This method is a physical process. Due to the inherent properties of the magnetic particles, agglomeration is very easy to occur. The magnetic particles will be subjected to great resistance during the filling process, resulting in blockage of the pores, which limits the effective dispersion of the particles, resulting in the formation of Composite particles aggregate and distribute unevenly, resulting in inhomogeneous airgel magnetic properties
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Method used

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  • Preparation method of magnetic cellulose aerogel
  • Preparation method of magnetic cellulose aerogel
  • Preparation method of magnetic cellulose aerogel

Examples

Experimental program
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Example Embodiment

[0041] Example 1

[0042] (1) Pretreatment of the fiber material: soak the dissolving eucalyptus pulp (provided by Chenhui Paper Co., Ltd.) in distilled water for 12 hours to break the hydrogen bonds between each other, and then use a dough mixer to make the fibers after water absorption. Relief to facilitate the next beating operation. Beat the cellulose dissolving pulp to 30°SR with a PFI refiner;

[0043] (2) Modification treatment of fiber material: at room temperature, add 80 parts by mass of isopropanol and 37.5 parts by mass of deionized water into a 1000ml round-bottomed flask, then add 1 part by mass of NaOH and 1 part by mass of dry eucalyptus to dissolve pulp. The round-bottomed flask was stirred with an electric stirrer for 2 hours at room temperature, and the stirring speed was 240 rpm;

[0044] (3) "Partial dissolution" of the fiber material: the fiber material after the treatment in step 2) was placed in a round-bottomed flask, 1.5 parts by mass of sodium chl...

Example Embodiment

[0053] Example 2

[0054] (1) Pretreatment of the fiber material: soak the dissolving eucalyptus pulp (provided by Chenhui Paper Co., Ltd.) in distilled water for 12 hours to break the hydrogen bonds between each other, and then use a dough mixer to make the fibers after water absorption. Relief to facilitate the next beating operation. Beat the cellulose dissolving pulp to 35°SR with a PFI refiner;

[0055] (2) Modification treatment of fiber material: at room temperature, add 100 parts by mass of isopropanol and 50 parts by mass of deionized water into a 1000ml round-bottomed flask, then add 1.25 parts by mass of NaOH and 1.25 parts by mass of dry eucalyptus to dissolve pulp. The round-bottomed flask was stirred with an electric stirrer for 3 hours at room temperature, and the stirring speed was 250 rpm;

[0056] (3) "Partial dissolution" of the fiber material: the fiber material after the treatment in step 2) was placed in a round-bottomed flask, 1.75 parts by mass of so...

Example Embodiment

[0065] Example 3

[0066](1) Pretreatment of fiber material: soak poplar pulp in distilled water for 12 hours to break the hydrogen bonds between each other, and then use a dough mixer to loosen the fibers after water absorption, which is convenient for the next beating operation. Beat the cellulose dissolving pulp to 33°SR with a PFI refiner;

[0067] (2) Modification treatment of fiber material: at room temperature, add 100 parts by mass of methanol and 30 parts by mass of deionized water into a 1000 ml round-bottomed flask, and then add 1 part by mass of NaOH and 1.25 parts by mass of dry poplar pulp . The round-bottomed flask was stirred with an electric stirrer for 2.5 hours at room temperature, and the stirring speed was 250 rpm;

[0068] (3) "Partial dissolution" of the fiber material: the fiber material after the treatment in step 2) is placed in a round-bottomed flask, a DMAC / LiCl mixed solution with a solute content of 2.5 parts by mass is added, and the round-bott...

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Abstract

The invention discloses a preparation method of magnetic cellulose aerogel. The method comprises the following steps: firstly carrying out pretreatment on fiber material, then carrying out modification treatment on the fiber material, and then carrying out partial dissolution on the fiber after modification treatment to prepare an aerogel cross-linking agent solution; preparing a magnetic materialraw solution; adding alkali and the magnetic material raw solution into a cellulose solution, and generating magnetic particles in the magnetic material solution; dispersing and adhering the magneticparticles to the surface of the fiber, carrying out evaporation and concentration on the solution, taking out remaining cellulose solution, adding a cross-linking agent solution under stirring and heating effects, heating until the temperature is 60 to 100 DEG C, carrying out preliminary gelation on the solution 2 to 6 hours later, and carrying out vacuum drying and freeze drying to obtain the magnetic aerogel. The magnetic composite aerogel obtained in the invention has the characteristics of low density, porosity, elasticity and the like, and due to the introduction of inorganic particles,the compressive strength of the material is improved, and the material has the characteristic of superparamagnetism.

Description

technical field [0001] The invention relates to the field of preparation technology of nanoporous materials, in particular to a method for preparing magnetic cellulose airgel by using natural polymer cellulose material as the main raw material. Background technique [0002] Gel is a new type of porous material, which is a special gel that replaces the liquid in the gel with gas without changing the network structure or volume of the gel itself. This material has a nanoscale porous structure and high porosity, which can be as high as 98%. The porous network structure of airgel makes it have unique properties, such as high porosity, high specific surface area, low light refractive index, low sound velocity, low thermal conductivity, low dielectric constant, etc. There are also various materials for preparing airgel. In terms of natural cellulose materials, they include nanocellulose, regenerated cellulose, and bacterial cellulose. The scope of application is quite wide, and ...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/24C08L1/02C08K3/16C08K3/30C08K3/22
Inventor 刘德桃欧阳豪路朋博林美燕苏灵峰
Owner SOUTH CHINA UNIV OF TECH
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