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Modified cellulose nanofiber stable Pickering emulsion and preparation method thereof

A cellulose and nanofiber technology is applied in the field of modified cellulose nanofiber-stabilized Pickering emulsion and its preparation, which can solve the problems of secondary environmental pollution, expensive catalysts, toxic solvents, etc. friendly effect

Inactive Publication Date: 2019-10-18
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the chemical modification process usually requires toxic solvents, high temperature and expensive catalysts, and most of the materials used are non-degradable petrochemical resources, which easily cause secondary pollution to the environment

Method used

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  • Modified cellulose nanofiber stable Pickering emulsion and preparation method thereof
  • Modified cellulose nanofiber stable Pickering emulsion and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Prepare an aqueous dispersion of cellulose nanofibers with a mass fraction of 2.0%, and adjust its pH to 3.0, add γ-aminopropyltriethoxysilane accounting for 5% of the mass of cellulose nanofibers to the system, and stir at room temperature for 6h , to obtain aminated cellulose nanofiber solution; prepare 60mL EDC / NHS ethanol solution, in which the mass fractions of EDC and NHS are 1.5% and 1.0% respectively, dissolve 0.1g oleic acid in EDC / NHS ethanol solution for activation for 15min, then add 10 mL of aminated cellulose nanofiber solution was stirred at room temperature for 24 h, the precipitate was collected after filtration and deionized water washing, and the precipitate was freeze-dried to obtain oleic acid modified cellulose nanofiber powder.

[0022] Disperse 0.02 g of oleic acid modified cellulose nanofiber powder in 2 mL of deionized water to form a modified cellulose nanofiber dispersion with a mass fraction of 1.0%, add 2 mL of dodecane to form an oil-water ...

Embodiment 2

[0024] Prepare an aqueous dispersion of cellulose nanofibers with a mass fraction of 2.0%, and adjust its pH to 3.0, add γ-aminopropyltriethoxysilane accounting for 5% of the mass of cellulose nanofibers to the system, and stir at room temperature for 6h , to obtain aminated cellulose nanofiber solution; prepare 60mL EDC / NHS ethanol solution, wherein the mass fractions of EDC and NHS are 1.5% and 1.0% respectively, dissolve 0.2g oleic acid in EDC / NHS ethanol solution and activate for 15min, then add 10mL of aminated cellulose nanofiber solution, stirred at room temperature for 24h, filtered and washed with deionized water to collect the precipitate, freeze-dried the precipitate to obtain oleic acid modified cellulose nanofiber powder, its infrared spectrum is as follows figure 2 shown.

[0025] Disperse 0.02g of oleic acid modified cellulose nanofiber powder in 2mL of deionized water to form a dispersion of modified cellulose nanofibers with a mass fraction of 1.0%, add 2mL o...

Embodiment 3

[0027] Prepare an aqueous dispersion of cellulose nanofibers with a mass fraction of 2.0%, and adjust its pH to 3.0, add γ-aminopropyltriethoxysilane accounting for 5% of the mass of cellulose nanofibers to the system, and stir at room temperature for 6h , to obtain aminated cellulose nanofiber solution; prepare 60mL EDC / NHS ethanol solution, in which the mass fractions of EDC and NHS are 1.5% and 1.0% respectively, dissolve 0.4g oleic acid in EDC / NHS ethanol solution and activate for 15min, then add 10 mL of aminated cellulose nanofiber solution was stirred at room temperature for 24 h, the precipitate was collected after filtration and deionized water washing, and the precipitate was freeze-dried to obtain oleic acid modified cellulose nanofiber powder.

[0028]Disperse 0.02g of oleic acid modified cellulose nanofiber powder in 2mL of deionized water to form a dispersion of modified cellulose nanofibers with a mass fraction of 1.0%, add 2mL of dodecane to form an oil-water mi...

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Abstract

The invention provides a modified cellulose nanofiber stable Pickering emulsion and a preparation method thereof. The preparation method of the modified cellulose nanofiber stable Pickering emulsion comprises the steps that modified cellulose nanofiber is added into deionized water and is dispersed uniformly, and modified cellulose nanofiber dispersion liquid with the mass fraction of 0.5-5% is formed; dodecane with the volume ratio to the deionized water of (0.1-9) to 1 is added into the dispersion liquid, an oil water mixture is formed, and the modified cellulose nanofiber stable Pickering emulsion is obtained through processing of a high-speed dispersion machine. The method is simple in preparation process, the cellulose nanofiber modified experiment condition is mild, poisonous solvents are not required, using materials are biologic materials, biocompatibility and renewability are achieved, and a green and environment-friendly nano-modification technology is achieved; and the prepared emulsion has the advantages of good stability, low cost, being environmental-friendly and the like, and important application value is achieved in the fields such as food and cosmetics.

Description

technical field [0001] The invention belongs to the field of biomass materials and applications, in particular to a modified cellulose nanofiber stabilized Pickering emulsion and a preparation method thereof. Background technique [0002] Emulsions are used in many industrial productions, such as crude oil recovery, interfacial polymerization, biomedicine, food and cosmetic preparation, fine chemical industry and many other fields. Emulsions can be divided into oil-in-water type (O / W) and water-in-oil type (W / O) according to type. Due to the large oil / water interface area, the emulsion is thermodynamically unstable. It is usually necessary to add an amphiphilic surfactant to the system to reduce the interfacial tension between the two phases, so as to obtain a stable emulsion. However, most of the surfactants used to stabilize emulsions are organically synthesized compounds, which have problems such as polluting the environment, unstable storage, and difficult to degrade....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/02C08L1/08
CPCC08J3/02C08J2301/08
Inventor 尚倩倩周永红杨晓慧刘承果胡云
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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