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Hydrophobic chitosan-silicon dioxide composite aerogel and preparation method and oil absorption application thereof

A composite aerogel and silica technology, applied in coatings and other directions, can solve the problems of weak mechanical properties, other properties decline, limited application, etc., and achieve the effects of high porosity, simple preparation process, and easy availability of raw materials

Inactive Publication Date: 2014-11-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Silica airgel has many excellent properties, but there is an important disadvantage, that is, its weak mechanical properties, which greatly limits its application.
But only the addition of inorganic fillers can improve its mechanical properties while reducing other properties.

Method used

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  • Hydrophobic chitosan-silicon dioxide composite aerogel and preparation method and oil absorption application thereof
  • Hydrophobic chitosan-silicon dioxide composite aerogel and preparation method and oil absorption application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (a) Dissolve 0.6 g of low-viscosity chitosan (20-200 mPa·s) in 0.5 vol% oxalic acid solution and stir until completely dissolved to form a uniform transparent solution. Add 6mL TEOS and stir for 12h until a completely uniform viscous sol without layering is formed. The sol was placed in a mold and aged for 36 hours to form a stable gel. Rinse and soak with deionized water several times to remove unreacted TEOS remaining in the gel and impurities during the reaction. Vacuum freeze-drying for 12 hours to obtain chitosan-silicon dioxide composite airgel.

[0033] (b) Drop the quantitative hydrophobic modifier HMDZ around the airgel obtained after freeze-drying, and place it at a constant temperature of 60°C. The evaporated modifier will slowly redeposit on the surface of the airgel. After 8 hours, a completely hydrophobic composite airgel was obtained.

[0034] (c) According to the contact angle test, the water contact angle of the prepared hydrophobic composite airgel ...

Embodiment 2

[0036] (a) Dissolve 0.4 g of medium-viscosity chitosan (200-400 mPa·s) in 0.5 vol% acetic acid solution, stir until completely dissolved, and form a uniform transparent solution. Add 5mL of water glass solution and stir for 12h until a completely uniform viscous sol without stratification is formed. The sol was placed in a mold and aged for 24 hours to form a stable gel. Rinse and soak with deionized water several times to remove unreacted raw materials remaining in the gel and impurities during the reaction. Vacuum freeze-drying for 12 hours to obtain chitosan-silicon dioxide composite airgel.

[0037] (b) Drop the quantitative hydrophobic modifier TMCS around the airgel obtained after freeze-drying, and place it at a constant temperature of 60 ° C. The evaporated modifier will slowly redeposit on the surface of the airgel. After 5 hours That is, a completely hydrophobic composite airgel is obtained.

[0038] (c) According to the contact angle test, the water contact angle...

Embodiment 3

[0040] (a) Dissolve 0.3 g of high-viscosity chitosan (400-1000 mPa·s) in 0.5 vol% carbonic acid solution, stir until completely dissolved, and form a uniform transparent solution. Add 5mL TEOS and stir for 15h until a completely uniform viscous sol without stratification is formed. The sol was placed in a mold and aged for 24 hours to form a stable gel. Rinse and soak with deionized water several times to remove unreacted TEOS remaining in the gel and impurities during the reaction. Vacuum freeze-drying for 12 hours to obtain chitosan-silicon dioxide composite airgel.

[0041] (b) Drop the quantitative hydrophobic modifier DMDCS around the airgel obtained after freeze-drying, and place it at a constant temperature of 50°C. The evaporated modifier will slowly redeposit on the surface of the airgel. After 5h That is, a completely hydrophobic composite airgel is obtained.

[0042] (c) According to the contact angle test, the water contact angle of the prepared hydrophobic comp...

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Abstract

The invention discloses hydrophobic chitosan-silicon dioxide composite aerogel and a preparation method and oil absorption application of the hydrophobic chitosan-silicon dioxide composite aerogel. The preparation method comprises the steps that a silicon source precursor is added into chitosan liquid and subjected to hydrolysis and condensation polymerization gradually to form viscous composite sol, wherein a large number of hydroxyl radicals and amino radicals in chitosan provide a large quantity of active sites, and the active sites serve as a supporting framework to participate in forming of a whole gel network structure; the composite sol is subjected to further ageing, the network structure is stabilized, and then composite gel is obtained; the composite gel is dried, solvents in the gel is removed, and then chitosan-silicon dioxide composite aerogel is obtained; the chitosan-silicon dioxide composite aerogel is subjected to hydrophobic modification through the vapor deposition method, modifying agent steam deposits on the surface of the chitosan-silicon dioxide composite aerogel at a constant temperature, and finally the hydrophobic chitosan-silicon dioxide composite aerogel is obtained. The preparation process is simple, raw materials are easy to get, and the prepared composite aerogel is low in density and high in porosity and has good hydrophobicity and lipophilicity and efficient oil absorption capacity.

Description

technical field [0001] The invention belongs to the technical field of organic-inorganic composite materials, and more specifically relates to a hydrophobic chitosan-silicon dioxide composite airgel, a preparation method thereof and an oil-absorbing application. Background technique [0002] Airgel is a new type of lightweight nanoporous solid material, which has many excellent properties due to its nanoporous structure, such as high porosity, high specific surface area, low density, low refractive index, low elastic modulus, low Acoustic impedance, low thermal conductivity, strong adsorption performance, etc. Airgel has a wide range of applications and can be used as an insulating layer with an ultra-low conductivity, sound insulation materials, sensors, catalysts and catalyst carriers, absorbents, heat insulation materials, electrode materials, etc. Airgel can be divided into organic, inorganic, carbonized and composite according to its composition. [0003] In recent ye...

Claims

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Application Information

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IPC IPC(8): C08J9/36C08J9/28C08L5/08C09K3/32
Inventor 侯信马倩刘燕飞
Owner TIANJIN UNIV
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