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Cellulose aerogel microspheres with light stress hydrophilic-hydrophobic conversion response functions, and preparation method thereof

A cellulose aerogel, hydrophilic and hydrophobic technology, which is applied in the field of preparation of aerogel microspheres, can solve the problems of high energy consumption of drying process, complicated preparation method, complicated and expensive equipment, etc., and is convenient for large-scale industrial production and preparation. Simple process and low price

Active Publication Date: 2019-07-26
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for airgel materials, especially cellulose airgel microsphere materials, the preparation method is complicated, the process is cumbersome, the equipment is complex and expensive, the drying process consumes high energy, and is dangerous.

Method used

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  • Cellulose aerogel microspheres with light stress hydrophilic-hydrophobic conversion response functions, and preparation method thereof
  • Cellulose aerogel microspheres with light stress hydrophilic-hydrophobic conversion response functions, and preparation method thereof
  • Cellulose aerogel microspheres with light stress hydrophilic-hydrophobic conversion response functions, and preparation method thereof

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preparation example Construction

[0030] A method for preparing cellulose airgel microspheres with light stress-hydrophilic conversion response function, comprising the following steps:

[0031] (1) Preparation of cellulose airgel microspheres

[0032] Mix sodium hydroxide, urea, and deionized water, pre-cool to 0 ~ -25°C, take out, add absorbent cotton, stir and dissolve to obtain cellulose hydrosol; mix cellulose hydrosol, deionized water, and crosslinking agent, Obtain the water phase; stir and mix the low surface tension solvent and surfactant evenly to obtain the oil phase; mix the water phase and the oil phase, and form a suspension by stirring, then add a silane modifier to it, 40~80°C Stir and react under heating conditions for 3h~10h. After the reaction, let stand, filter, wash, and dry under normal pressure at 70~120℃ for 1~15h to obtain cellulose airgel microspheres;

[0033] In the preparation of cellulose hydrosol, the mass ratio of sodium hydroxide, urea, deionized water and absorbent cotton is ...

Embodiment 1

[0042] (1) Preparation of cellulose airgel microspheres

[0043] Mix 2 g of sodium hydroxide, 5 g of urea, and 100 g of deionized water, pre-cool to -7°C, take out, add 2 g of absorbent cotton, stir and dissolve to obtain cellulose hydrosol; mix 100 g of cellulose hydrosol, 200 g of deionized Mix ionic water and 0.2 g ammonium zirconium carbonate to obtain the water phase; stir and mix 100 g of n-hexane and 1 g Span-65 evenly to obtain the oil phase; mix 80 g of the water phase and 100 g of the oil phase, and make the system form a suspension by stirring Finally, add 1 g of hexamethyldisilazane, stir and react under heating at 60°C for 8 hours, after the reaction, let stand, filter, wash, and dry under normal pressure at 100°C for 10 hours to obtain cellulose airgel microspheres;

[0044] (2) Preparation of cellulose airgel microspheres with light-stressed hydrophilic-hydrophobic switching response function

[0045] Dissolve tannic acid in ethanol, adjust the pH to 8.5, and o...

Embodiment 2

[0051] (1) Preparation of cellulose airgel microspheres

[0052] Mix 1 g sodium hydroxide, 12 g urea, and 100 g deionized water, pre-cool to 0°C, take out, add 10 g absorbent cotton, stir and dissolve to obtain cellulose hydrosol; mix 100 g cellulose hydrosol, 2000 g deionized Mix water and 10g of glyoxal to obtain the water phase; stir and mix 100g of n-hexane and 1.5g of Span-65 evenly to obtain the oil phase; mix 20g of the water phase and 100g of the oil phase, and make the system form a suspension by stirring , adding 5 g of hexamethyldisiloxane, stirring and reacting at 40°C for 10 hours, after the reaction was completed, standing, filtering, washing, and drying under normal pressure at 120°C for 1 hour to obtain cellulose airgel microspheres;

[0053] (2) Preparation of cellulose airgel microspheres with light-stressed hydrophilic-hydrophobic switching response function

[0054] Dissolve tannic acid in ethanol, adjust the pH to 7.1, and obtain a tannic acid solution wi...

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Abstract

The invention discloses cellulose aerogel microspheres with light stress hydrophilic-hydrophobic conversion response functions, and a preparation method thereof. According to the method, cellulose aerogel is made from degreased cotton, the cellulose aerogel microspheres are obtained through reverse phase suspension and ambient pressure drying, titanium dioxide is loaded onto the surfaces of the cellulose aerogel microspheres through bridging of tannic acid, and accordingly, the cellulose aerogel microspheres with the special light stress hydrophilic-hydrophobic conversion response functions are prepared. The technological process for preparation is simple, and the equipment requirements are low; production raw materials are cheap, solvents are easy to recover, the cost is low, and the yield is high; the preparation process does not require a tedious solvent replacement process in conventional normal pressure drying of aerogel, and large-scale industrial production is facilitated. The prepared microspheres are spherical particles, the average grain diameter can be controlled in the range of 1-2000 micrometers, and the microspheres have the light stress hydrophilic-hydrophobic conversion response functions and can be applied to the fields such as oil-water separation, heat insulation, chromatographic separation, catalysis, biological drug loading and blood purification.

Description

technical field [0001] The invention relates to a preparation method of airgel microspheres, in particular to a cellulose airgel microsphere with a light-stressed hydrophilic-hydrophobic switching response function and a preparation method thereof. Background technique [0002] Airgel is a kind of highly dispersed solid material with nano-scale particles aggregated to form a nano-porous network structure, and the pores are filled with a gaseous dispersion medium. Because of its nano-porous structure, low density, low dielectric constant, Low thermal conductivity, high porosity, high specific surface area and other characteristics, showing unique properties in mechanics, acoustics, heat, optics and other aspects, in aerospace, military, petroleum, chemical, mineral, communication, medical, building materials, electronics, metallurgy It has extensive and huge application value in many fields, and is called "the magic material that changes the world". It has developed rapidly i...

Claims

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Application Information

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IPC IPC(8): B01J13/00
CPCB01J13/0091
Inventor 彭新艳刘云鸿
Owner QUANZHOU NORMAL UNIV
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