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Modified nanocellulose crystal and preparation method thereof

A technology of nanocellulose and crystals, applied in the field of hydrophobic graft modification on the surface of nanoparticles, which can solve the problems of high reaction temperature and poor durability

Active Publication Date: 2021-04-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when fatty acids are used for modification, strong acids need to be used as catalysts, and at the same time, they have the disadvantage of high reaction temperature.
Organosiloxane is the most commonly used modifier for organosilylation. However, the -Si-OH bond formed by the hydrolysis of organosiloxane is difficult to condense with the -C-OH on the surface of nanocellulose crystals to form a -C-O-Si bond. , therefore, its modified durability is poor

Method used

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  • Modified nanocellulose crystal and preparation method thereof
  • Modified nanocellulose crystal and preparation method thereof
  • Modified nanocellulose crystal and preparation method thereof

Examples

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Embodiment 1

[0040] This embodiment provides a modified nanocellulose crystal, wherein the modified cellulose crystal is prepared by any one of the following method 1 or method 2:

[0041] method one:

[0042] 1) Add 100 g of tetrahydrofuran and 1 g of nanocellulose crystals to the reaction vessel, and uniformly disperse the nanocellulose crystals by magnetic stirring; continue to add 1.0 g of dibutyltin dilaurate to the reaction vessel, and then feed nitrogen into the reaction vessel;

[0043] 2) Mix 0.5 g of hexamethylene diisocyanate and 50 g of tetrahydrofuran to obtain mixed liquid A; under the condition of nitrogen protection, add the mixture dropwise to the reaction vessel after adding dibutyltin dilaurate through a constant pressure funnel to step 1) Solution A, stirred and reacted at room temperature for 12 hours; the product obtained from the reaction was filtered through a metafluoride membrane, washed with tetrahydrofuran, and then dried at 65°C to obtain modified nanocellulose...

Embodiment 2

[0051] This embodiment provides a modified nanocellulose crystal, wherein the modified cellulose crystal is prepared by any one of the following method 1 or method 2:

[0052] method one:

[0053] 1) Add 150 g of tetrahydrofuran and 1 g of nanocellulose crystals to the reaction vessel, and uniformly disperse the nanocellulose crystals by magnetic stirring; continue to add 1.0 g of dibutyltin dilaurate to the reaction vessel, and then feed nitrogen into the reaction vessel;

[0054] 2) Mix 1.0 g of 2,2,4-trimethylhexamethylene diisocyanate and 50 g of tetrahydrofuran to obtain mixed liquid A; under nitrogen protection, add dilauric acid dilaurate to step 1) through a constant pressure funnel Add the mixed solution A dropwise to the reaction vessel after butyltin, and stir and react at room temperature for 18 hours; the product obtained by the reaction is filtered with a metafluoride membrane, washed with tetrahydrofuran, and then dried at 80°C to obtain modified nanocellulose c...

Embodiment 3

[0061] This embodiment provides a modified nanocellulose crystal, wherein the modified cellulose crystal is prepared by any one of the following method 1 or method 2:

[0062] method one:

[0063] 1) Add 50 g of tetrahydrofuran and 1 g of nanocellulose crystals to the reaction vessel, and uniformly disperse the nanocellulose crystals by magnetic stirring; continue to add 1.5 g of dibutyltin dilaurate to the reaction vessel, and then feed nitrogen into the reaction vessel;

[0064] 2) Mix 2.0g of 2,4,4-trimethylhexamethylene diisocyanate and 50g of tetrahydrofuran to obtain mixed liquid A; under nitrogen protection, add dilauric acid dilaurate to step 1) through a constant pressure funnel Add the mixed solution A dropwise to the reaction container after butyltin, and stir and react at room temperature for 18 hours; the product obtained by the reaction is filtered with a metafluoride membrane, washed with tetrahydrofuran, and then dried at 90°C to obtain modified nanocellulose c...

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Abstract

The invention provides a modified nanocellulose crystal and a preparation method thereof. The modified nanocellulose crystal is a diisocyanate modified nanocellulose crystal, and two -NCOs of diisocyanate react with nanocellulose -OH respectively and are connected to the surface of nanocellulose through -NH-COO- bonds; wherein the mass ratio of the diisocyanate to the nano cellulose crystals is 0.01: 1-6: 1. The preparation method comprises the following steps: mixing nanocellulose crystals with part of an organic solvent, adding a catalyst, and adding a mixed solution of diisocyanate and the remaining organic solvent in a protective gas atmosphere to react, thereby obtaining the modified nanocellulose crystals. The modified nanocellulose crystal has excellent emulsifying property and overcomes the problem of application limitation caused by overhigh polarity of the nanocellulose crystal.

Description

technical field [0001] The invention specifically relates to a modification method for hydrophobic grafting of nano-cellulose crystals, and belongs to the technical field of hydrophobic graft modification on the surface of nanoparticles. Background technique [0002] Nanocellulose crystals are a renewable, degradable, and low-toxicity new type of nanomaterials, which come from a wide range of sources in nature. It has great potential application value in fields such as medicine, chemical industry and food. [0003] In recent years, the use of nanocellulose crystals in the preparation of Pickering emulsions has attracted widespread attention from researchers. The prepared emulsions have good stability and low foaming characteristics, and compared with traditional spherical nanoparticles, they have unique characteristics. The aspect ratio of rod-shaped nanocellulose crystals can be adjusted, so that the size and shape of Pickering emulsion droplets can be adjusted. As a nanop...

Claims

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Application Information

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IPC IPC(8): C08B15/06
CPCC08B15/06C08B15/00
Inventor 彭宝亮罗健辉雷群王小聪肖沛文张欣向王平美丁彬耿向飞李莹莹
Owner PETROCHINA CO LTD
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