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Preparation method of hydrophilic-oleophobic cellulose/silane coupling agent composite aerogel

A silane coupling agent and composite aerogel technology, applied in the field of cellulose-based functional materials, can solve the problems of insufficient hydrophilic and oleophobic performance, high cost, complicated preparation process of cellulose aerogel, etc. The effect of excellent oleophobicity, low cost, good compressibility and durability

Active Publication Date: 2019-11-12
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of complex preparation process, high cost and insufficient hydrophilic and oleophobic properties of cellulose airgel in the prior art, and to provide a hydrophilic-oleophobic fiber with simple process and low cost. Fiber-based cellulose / silane coupling agent composite airgel and preparation method thereof

Method used

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  • Preparation method of hydrophilic-oleophobic cellulose/silane coupling agent composite aerogel
  • Preparation method of hydrophilic-oleophobic cellulose/silane coupling agent composite aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Hydrophilic-oleophobic cellulose / silane coupling agent composite airgel, the preparation steps of which are:

[0031] (1) Preparation of a cellulose suspension with a pH value of 4:

[0032] First, the wood pulp cellulose nanofiber powder is dispersed in deionized water to obtain a wood pulp cellulose nanofiber suspension with a solid content of 0.5 wt%, and then a hydrochloric acid solution with a concentration of 0.5 wt% is added thereto to adjust the pH value to 4, Finally, stir for 30min at a stirring speed of 800r / min;

[0033] (2) Preparation of composite suspension:

[0034] First, mix tridecafluorooctyltrimethoxysilane, vinyltrimethoxysilane and 1,2-bistrimethoxysilylethane with a mass ratio of 1:1:0.2, and then add the mixture dropwise (one drop volume of 10 μL) was added to the cellulose suspension with a pH value of 4 to obtain a composite suspension, wherein the mass ratio of the mixture to the cellulose suspension with a pH value of 4 was 1:20;

[0035] ...

Embodiment 2

[0057] Hydrophilic-oleophobic cellulose / silane coupling agent composite airgel, the preparation steps of which are:

[0058] (1) Preparation of a cellulose suspension with a pH value of 8:

[0059] First disperse the cotton cellulose nanofiber powder in deionized water to obtain a cotton cellulose nanofiber suspension with a solid content of 0.8wt%, then add a sodium hydroxide solution with a concentration of 0.8wt% to it, adjust the pH value to 8, Finally, stir for 25min at a stirring speed of 1100r / min;

[0060] (2) Preparation of composite suspension:

[0061] First, mix tridecafluorooctyltriethoxysilane, vinyltriethoxysilane and 1,2-bistriethoxysilylethane with a mass ratio of 2:1.5:0.35, and then mix the mixture gradually Drops (the volume of one drop is 50 μL) are added to the cellulose suspension with a pH value of 8 to obtain a composite suspension, wherein the mass ratio of the mixture to the cellulose suspension with a pH value of 8 is 1:20;

[0062] (3) Preparati...

Embodiment 3

[0066] Hydrophilic-oleophobic cellulose / silane coupling agent composite airgel, the preparation steps of which are:

[0067] (1) Preparation of a cellulose suspension with a pH value of 9:

[0068] First, dispersing the wood pulp cellulose nanofiber powder in deionized water to obtain a wood pulp cellulose nanofiber suspension with a solid content of 1.3 wt%, then adding a concentration of 1.3 wt% ammonia solution to it, adjusting the pH value to 9, Finally, stir for 15min at a stirring speed of 1500r / min;

[0069] (2) Preparation of composite suspension:

[0070] Firstly mix heptadecafluorodecyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane and 1,2-bistrimethoxysilylethane with a mass ratio of 2:1:0.3 , and then add the mixture dropwise (the volume of one drop is 100 μL) to the cellulose suspension with a pH value of 9 to obtain a composite suspension, wherein the mass ratio of the mixture to the cellulose suspension with a pH value of 9 is 1:20 ;

[0071] (3) Pre...

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Abstract

The invention relates to a hydrophilic-oleophobic cellulose / silane coupling agent composite aerogel and a preparation method thereof. The preparation method comprises the following steps: adding a mixture of silane coupling agents A, B and C into a cellulose suspension with the pH value of 3-4 or 8-9 to obtain a composite suspension, freezing the composite suspension to form gel, and carrying outfreeze drying treatment on the gel to obtain the hydrophilic-oleophobic cellulose / silane coupling agent composite aerogel. The hydrophilic-oleophobic cellulose / silane coupling agent composite aerogelis mainly composed of cellulose aerogel and three types of silane coupling agents A, B and C, wherein the silane coupling agents A, B and C are randomly arranged on the surface of the cellulose aerogel and are connected with the cellulose aerogel through hydroxyl condensation. The hydrophilic-oleophobic cellulose / silane coupling agent composite aerogel is simple in preparation process, low in cost, excellent in hydrophilic and oleophobic performance and wide in application range.

Description

technical field [0001] The invention belongs to the technical field of cellulose-based functional materials, and relates to a hydrophilic-oleophobic cellulose / silane coupling agent composite airgel and a preparation method thereof. Background technique [0002] With the massive discharge of oily sewage in production and life and the frequent occurrence of offshore oil spill accidents, the demand for oil-water separation and adsorption materials has become very urgent. Industrially, the extraction of offshore oil requires a large amount of filtered seawater to recover the oil, and similarly, in order to maintain the service life of the engine, the water impurities in the fuel must be removed. At present, there are mainly two kinds of adsorption materials for oil-water separation, one is hydrophobic and oleophilic materials, and the other is hydrophilic and oleophobic materials. When the oil content in oily sewage is greater than the water content, due to the limited oil adso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L1/02C08L97/02C08L83/08
CPCC08J9/28C08J2201/0484C08J2205/026C08J2301/02C08J2397/02C08J2483/08
Inventor 赵燕吴柱张涛
Owner SUZHOU UNIV
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