A kind of preparation method of oil-absorbing material with hierarchical porous structure

An oil-absorbing material and multi-stage pore technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as the collapse of airgel oil-absorbing structures, achieve excellent hydrophobicity and lipophilicity, excellent oil absorption performance, and solve low adsorption capacity Effect

Active Publication Date: 2021-05-07
蓝烟新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of the prior art, the present invention uses bacterial cellulose and siloxane as raw materials, uses bacterial cellulose as a skeleton to solve the problem of structural collapse in the airgel oil absorption process, and uses methyltriethoxysilane as a silicon source to prepare oxidized Silica airgel is filled into bacterial cellulose airgel to provide hydrophobic groups and high porosity to prepare composites with excellent oil absorption properties

Method used

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  • A kind of preparation method of oil-absorbing material with hierarchical porous structure
  • A kind of preparation method of oil-absorbing material with hierarchical porous structure
  • A kind of preparation method of oil-absorbing material with hierarchical porous structure

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Embodiment 1

[0035]A method for preparing an oil-absorbing material with a hierarchical porous structure, the molar ratio of methyltriethoxysilane: water: nitric acid: ethanol = 1:2:0.06:6.8, and the silica concentration in the obtained silica sol is 0.25mol / L, the bacterial cellulose airgel drying medium is water, and the composite drying medium is tert-butanol. Follow the steps in order:

[0036] (1) Preparation of bacterial cellulose airgel

[0037] 5 g of bacterial cellulose with a moisture content of 75 wt % was placed in 200 ml of water to be mechanically sheared by a shearing machine, and the rotational speed of the shearing machine was 1000 rpm. The obtained bacterial cellulose hydrosol with a density of 6 mg / ml was placed in a beaker and freeze-dried for 24 hours to obtain a bacterial cellulose aerogel with a density of 30 mg / ml;

[0038] (2) Preparation of silica sol

[0039] At a temperature of 20°C, dissolve 1.66g of methyltriethoxysilane in 314g of ethanol and prepare an a...

Embodiment 2

[0049] A method for preparing an oil-absorbing material with a hierarchical porous structure, the molar ratio of methyltriethoxysilane:water:nitric acid:ethanol=1:3:0.12:4.7, and the silicon oxide concentration in the obtained silica sol is 0.35mol / L, the bacterial cellulose airgel drying medium is water, and the composite drying medium is tert-butanol. Follow the steps in order:

[0050] (1) Preparation of bacterial cellulose airgel

[0051] The bacterial cellulose with a moisture content of 5 g and a moisture content of 78 wt % was placed in 300 ml of water for mechanical shearing by a shearing machine, and the rotational speed of the shearing machine was 2000 rpm. The obtained bacterial cellulose hydrosol with a density of 4 mg / ml was placed in a beaker and freeze-dried for 36 hours to obtain a bacterial cellulose aerogel with a density of 20 mg / ml;

[0052] (2) Preparation of silica sol

[0053] At a temperature of 4°C, dissolve 1.66g of methyltriethoxysilane in 218.4g...

Embodiment 3

[0062] A method for preparing an oil-absorbing material with a hierarchical porous structure, the molar ratio of methyltriethoxysilane: water: nitric acid: ethanol = 1: 2.5: 0.08: 3.3, and the silicon oxide concentration in the obtained silica sol is 0.5 mol / L, the bacterial cellulose airgel drying medium is water, and the composite drying medium is tert-butanol. Follow the steps in order:

[0063] (1) Preparation of bacterial cellulose airgel

[0064] 5 g of bacterial cellulose with a moisture content of 80 wt % was placed in 300 ml of water to be mechanically sheared by a shearing machine, and the rotational speed of the shearing machine was 3000 rpm. The obtained bacterial cellulose hydrosol with a density of 4 mg / ml was placed in a beaker for 48 hours of freeze-drying to obtain a bacterial cellulose aerogel with a density of 20 mg / ml;

[0065] (2) Preparation of silica sol

[0066] At a temperature of 40°C, dissolve 1.66g of methyltriethoxysilane in 152g of ethanol and...

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Abstract

The invention relates to a preparation method of an oil-absorbing material with a multi-level porous structure; the invention prepares a low-density bacterial cellulose aerogel by self-assembly through mechanical stirring and freeze-drying processes in advance, and then in a vacuum state and with a methyl Siloxane is used as the precursor to prepare the silica gel composite, and the superelastic, superhydrophobic and superoleophilic oil-absorbing material with hierarchical porous structure is prepared by freeze-drying process. Its maximum elastic deformation can reach 40% to 80%, and it can return to its original size after pressure relief. At the same time, its contact angle is 145°-152°, and it has high adsorption capacity for various organic substances and oil stains, and the adsorption quality factor is between 8-11. Due to its superelasticity and excellent oil absorption performance, the composite material can also effectively recover the adsorbed oil, and the maximum recovery can reach 80%-90%. The technical problems such as low adsorption capacity, low oil absorption selectivity and inability to recycle the oil-absorbing material in actual use are solved.

Description

technical field [0001] The invention belongs to the technical field of inorganic material preparation and sol-gel method, and in particular relates to a method for preparing an oil-absorbing material with a multi-level porous structure, superelasticity and high adsorption capacity by using bacterial cellulose composite airgel. Background technique [0002] With the rapid development of today's world economy, people's demand for oil is increasing day by day. In the process of oil transportation and exploitation, frequent oil spill accidents have caused great damage to the marine ecological environment and seriously threatened the surrounding ecological environment and human health. Therefore, effectively solving the problem of oil pollution has become an urgent and arduous task today. Task. At present, there are mainly the following methods to deal with oil pollution: 1. Direct combustion method; 2. Physical mechanical method, such as deploying oil booms and oil skimmers; 3....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40C08J9/28C08L1/02B01J20/24B01J20/30
CPCB01J20/103B01J20/24C08J9/28C08J9/40C08J2201/0484C08J2205/026C08J2301/02
Inventor 李晓雷何健赵航远于慧君季惠明苏冬
Owner 蓝烟新材料科技有限公司
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