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Method for preparing Pickering emulsion by utilizing modified nano-crystalline cellulose

A nano-cellulose modification technology, applied in the field of Pickering emulsion prepared by using modified nano-cellulose, can solve the problem of ineffective stable emulsion and achieve the effects of less CNC consumption, large surface area, and low application cost

Active Publication Date: 2017-05-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the surface of CNC has a large number of hydroxyl groups and is extremely hydrophilic, it cannot effectively stabilize the emulsion when it is used as a Pickering emulsion stabilizer. Therefore, it needs to be surface modified to make it have a certain degree of hydrophobicity.

Method used

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  • Method for preparing Pickering emulsion by utilizing modified nano-crystalline cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Get amphiphilic block copolymer modified nanocellulose (MCNC) and grind it into powder to obtain amphiphilic block copolymer modified nanocellulose powder;

[0043] Weigh the amphiphilic block copolymer modified nanocellulose powder and deionized water at a mass ratio of 1:1000; weigh the amphiphilic block copolymer modified nanocellulose powder and deionized water Mix with water to form a mixed solution; place the mixed solution in an ultrasonic cell pulverizer with a power of 20% and disperse for 5 minutes to obtain a light yellow modified nanocellulose dispersion;

[0044] Weigh liquid paraffin and add it to the modified nanocellulose dispersion, wherein the volume ratio of liquid paraffin to the modified nanocellulose dispersion is 1:9 to form a mixture; wherein, the pH range of the modified nanocellulose dispersion is is 1; the obtained mixture is mixed and emulsified in an ultrasonic cell pulverizer with a power of 20%, to obtain a stable Pickering emulsion.

Embodiment 2

[0046] Get amphiphilic block copolymer modified nanocellulose (MCNC) and grind it into powder to obtain amphiphilic block copolymer modified nanocellulose powder;

[0047] Weigh the amphiphilic block copolymer modified nano-cellulose powder and deionized water at a mass ratio of 1:100; weigh the amphiphilic block copolymer-modified nano-cellulose powder and deionized water mixed with water to form a mixed solution; the mixed solution was dispersed in an ultrasonic cell pulverizer with a power of 30% for 10 minutes to obtain a light yellow modified nanocellulose dispersion;

[0048]Weigh n-heptane and add it to the modified nanocellulose dispersion, wherein the volume ratio of n-heptane to the modified nanocellulose dispersion is 1:7 to form a mixture; wherein, the pH of the modified nanocellulose dispersion The value range is 7; the obtained mixture is mixed and emulsified in an ultrasonic cell pulverizer with a power of 30%, to obtain a stable Pickering emulsion.

Embodiment 3

[0050] Get amphiphilic block copolymer modified nanocellulose (MCNC) and grind it into powder to obtain amphiphilic block copolymer modified nanocellulose powder;

[0051] Weigh the amphiphilic block copolymer modified nanocellulose powder and deionized water respectively according to the mass ratio of 1:25; the weighed amphiphilic block copolymer modified nanocellulose powder and deionized water Mix with water to form a mixed solution; place the mixed solution in an ultrasonic cell pulverizer with a power of 30% and disperse for 20 minutes to obtain a light yellow modified nanocellulose dispersion;

[0052] Weigh methyl methacrylate and add it to the modified nanocellulose dispersion, wherein the volume ratio of methyl methacrylate to the modified nanocellulose dispersion is 1:1 to form a mixture; wherein, the modified nanocellulose The pH range of the dispersion liquid was 9; the obtained mixture was mixed and emulsified in an ultrasonic cell pulverizer with a power of 40%, ...

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Abstract

The invention discloses a method for preparing Pickering emulsion by utilizing modified nano-crystalline cellulose. The method comprises the following steps: 1) taking the nano-crystalline cellulose modified with an amphiphilic segmented copolymer and grinding into powder, thereby acquiring the amphiphilic segmented copolymer modified nano-crystalline cellulose powder; 2) dispersing the amphiphilic segmented copolymer modified nano-crystalline cellulose powder acquired in the step 1) into deionized water, thereby forming modified nano-crystalline cellulose dispersion liquid; and 3) weighting an oily solvent, adding into the modified nano-crystalline cellulose dispersion liquid acquired in the step 2), and mixing and emulsifying, thereby forming stable Pickering emulsion. The method for preparing the Pickering emulsion by utilizing the modified nano-crystalline cellulose has the characteristics of less CNC dosage and low application cost.

Description

technical field [0001] The invention belongs to the technical field of material preparation methods, and in particular relates to a method for preparing Pickering emulsion by using modified nanocellulose. Background technique [0002] Pickering emulsion refers to a stable emulsion that uses solid particles instead of traditional surfactants. The properties of Pickering emulsion have a great relationship with the surface wettability of particles. Pickering emulsion cannot be formed if it is too hydrophilic or too hydrophobic. Compared with emulsions stabilized by traditional surfactants, Pickering emulsions have their own advantages: 1) It can significantly reduce the amount of emulsifier used to save costs; 2) It is far less harmful to the human body than surfactants; 3) It is harmful to the environment Friendly; 4) It is not easily affected by external environmental factors, and the emulsion has strong stability. Therefore, it has important application prospects in the fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/05C08L87/00C08L1/02
CPCC08J3/05C08J2301/02C08J2387/00C08L1/02C08L87/005C08L2201/54
Inventor 周建华李艳南马建中
Owner SHAANXI UNIV OF SCI & TECH
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