A method for preparing hydrophobically modified nanocellulose using a microchannel reaction system

A technology of nanocellulose and microchannel reaction, applied in chemical instruments and methods, chemical/physical/physicochemical reactors, chemical/physical/physicochemical processes, etc., can solve the adverse effects of alkoxy silicon group stability , The production route is not environmentally friendly, the storage stability is affected, etc., to achieve the effect of high commercial promotion value, excellent hydrophobic effect, and high product reliability

Active Publication Date: 2022-03-29
QUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN2019100585376 discloses a preparation method of fluorosilane-modified nanocellulose and the obtained modified cellulose. Patent CN2019106718691 discloses a modified nanocellulose and its preparation method. Both of the above two schemes contain alkane that is easily hydrolyzed. Oxysilyl groups, which affect storage stability
The performance of the product after hydrolysis will be significantly reduced, which will affect its commercial promotion
[0005] In addition, in the patent CN2019106718691, due to the existence of the acid agent, it is difficult to completely remove it during the centrifugation process, and it will also have a negative impact on the stability of the alkoxy silicon group; and the separated acid agent produces waste solids. So the production route is not environmentally friendly

Method used

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  • A method for preparing hydrophobically modified nanocellulose using a microchannel reaction system
  • A method for preparing hydrophobically modified nanocellulose using a microchannel reaction system
  • A method for preparing hydrophobically modified nanocellulose using a microchannel reaction system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) 320g nanocellulose and 1000g butanone were mixed and ultrasonically dispersed to form a uniform dispersion, then 1.6g of catalyst dibutyltin dilaurate was added, and stirred to obtain dispersion a;

[0052] (2) 46.88g of single-ended isocyanate group-containing fluoride A was dissolved in 100g of butanone to form solution b;

[0053] (3) 33.15g single-end isocyanate group-containing alkane-based compounds C were dissolved in 40g butanone to form solution c;

[0054] (4) The dispersion liquid a, solution b and solution c are simultaneously pumped into the micro-mixer of the micro-channel reaction system to mix evenly, and then enter the micro-channel reactor of the micro-channel reaction system to carry out the reaction. The reaction temperature is 80 °C, and the reaction The time is 15min;

[0055](5) centrifuging and drying the reaction product in step (4) to obtain hydrophobically modified nanocellulose.

[0056] Fourier transform infrared spectrometer was used ...

Embodiment 2

[0063] (1) 320g nanocellulose and 1000g butanone were mixed and ultrasonically dispersed to form a uniform dispersion, then 1.6g of catalyst dibutyltin dilaurate was added, and stirred to obtain dispersion a;

[0064] (2) 46.88g of single-ended isocyanate group-containing fluoride A was dissolved in 100g of butanone to form solution b;

[0065] (3) 33.15g single-end isocyanate group-containing alkane-based compounds C were dissolved in 40g butanone to form solution c;

[0066] (4) The dispersion liquid a and the solution b are simultaneously pumped into the first micro-mixer of the micro-channel reaction system to mix evenly, and then enter the first micro-channel reactor of the micro-channel reaction system to carry out the reaction. The reaction product and the solution c are simultaneously They are respectively pumped into the second micro-mixer of the micro-channel reaction system to mix evenly, and then enter the second micro-channel reactor of the micro-channel reaction ...

Embodiment 3

[0070] The rest is the same as in Example 4, except that the dispersion liquid a is first reacted with the solution c, and then the reactant is reacted with the solution b.

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Abstract

The invention provides a method for preparing hydrophobically modified nanocellulose by utilizing a microchannel reaction system, which comprises nanocellulose dispersion liquid, a fluoride solution containing isocyanate group at one end and an alkane compound solution containing isocyanate group at one end. The step of mixing in the micro-mixer of the micro-channel reaction system and then entering the micro-channel reactor of the micro-channel reaction system for reaction. The preparation method of the present invention is safe, environmentally friendly and efficient, and the prepared modified nanocellulose has excellent storage stability, excellent hydrophobic effect, and the modified product is uniformly dispersed, has good interfacial compatibility with organic systems, and has high commercial promotion value.

Description

technical field [0001] The invention relates to a method for preparing hydrophobically modified nanocellulose by utilizing a microchannel reaction system, and belongs to the technical field of cellulose modification. Background technique [0002] The preparation of nanocellulose is rich in raw materials, and has the advantages of light weight, degradability, renewability and biocompatibility of biological materials, and has large specific surface area, high crystallinity, high strength, high hydrophilicity and high heat. stability and many other excellent properties. However, due to the presence of hydrogen bonds in a large number of hydroxyl groups on its surface, it is prone to a certain degree of irreversible aggregation and agglomeration, and the dispersion is not uniform. The poor compatibility and poor interfacial adhesion greatly limit its application in many fields. Based on this, we hope that it can be modified to reduce its surface free energy, make nanocellulose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/06B01J19/00
CPCC08B15/06B01J19/0093
Inventor 刘国清郑土才潘向军董云渊李晓东
Owner QUZHOU UNIV
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