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A kind of modified nanocellulose and its preparation method and application

A nanocellulose and cellulose technology, which is applied to artificial filaments made of cellulose derivatives and grain processing, etc., can solve the problems of cumbersome preparation methods and harsh reaction conditions, and achieve good transparency, small diameter and good quality. Effects of hydrophobicity and UV resistance

Active Publication Date: 2022-04-22
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a preparation method is too cumbersome and often requires harsh reaction conditions.

Method used

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  • A kind of modified nanocellulose and its preparation method and application
  • A kind of modified nanocellulose and its preparation method and application
  • A kind of modified nanocellulose and its preparation method and application

Examples

Experimental program
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Embodiment 1

[0028] This embodiment provides a method for preparing modified nanocellulose, comprising the following steps:

[0029] Weigh 0.5g of bamboo pulp and 3.4819g of 3,4-dichlorophenyl isocyanate (wherein the molar ratio of 3,4-dichlorophenyl isocyanate and the hydroxyl group in bamboo pulp is 2:1) and join in the ball mill, then add 20mL Dimethyl sulfoxide was ball milled for 2 hours at a speed of 200 rpm.

Embodiment 2

[0031] This embodiment provides a method for preparing modified nanocellulose, comprising the following steps:

[0032] Weigh 0.5g corncob cellulose and 3.4819g 3,4-dichlorophenyl isocyanate (wherein the molar ratio of 3,4-dichlorophenylisocyanate and corncob cellulose to the hydroxyl group is 2:1) and add them to the ball mill , and then added 25 mL dimethyl sulfoxide, and ball milled together at a speed of 300 rpm for 2 h.

Embodiment 3

[0034] This embodiment provides a method for preparing modified nanocellulose, comprising the following steps:

[0035] Weigh 0.5g corn cob cellulose and 0.1741g 3,4-dichlorophenyl isocyanate (wherein the molar ratio of 3,4-dichlorophenyl isocyanate and corn cob cellulose to the hydroxyl group is 1:10) and add them to the ball mill , and then add 20mL dimethyl sulfoxide, and ball mill together at a speed of 200 rpm for 2h.

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Abstract

The present invention provides a modified nano-cellulose and its preparation method and application. The preparation method of the modified nano-cellulose comprises: combining cellulose or cellulose derivatives with 3,4-dichlorophenyl isocyanate in an aprotic Co-ball milling in polar organic solvents. The present invention adopts mechanochemical method to apply mechanical force while using 3,4-dichlorophenyl isocyanate to chemically modify cellulose or cellulose derivatives, so that the modified nanometer with water-resistant and anti-ultraviolet properties can be prepared in one step. Cellulose is simple and efficient; and chemical modification and ball milling play a synergistic effect, making the diameter of the modified nanocellulose smaller, so that the obtained modified nanocellulose has better transparency after being made into a film.

Description

technical field [0001] The invention relates to the field of nanofiber materials, more specifically, to a modified nanocellulose and its preparation method and application. Background technique [0002] With the development of nanotechnology, nanocellulose has become a widely used functional polymer material. Nanocellulose is generally defibrillated from natural cellulose or cellulose derivatives through a series of physical or chemical treatments to become nanoscale cellulose. [0003] Due to the outstanding physical and chemical properties of nanocellulose, such as nanoscale, superior mechanical properties, renewable, biodegradable, etc., people place higher expectations on it and hope to expand nanocellulose through modification. Applications, such as water-resistant and UV-resistant materials. [0004] In the prior art, the preparation of nanocellulose with anti-water and anti-ultraviolet properties is mostly to make the cellulose into nanocellulose, and then chemicall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/06D01F2/24D01F2/28B02C17/00
CPCC08B15/06D01F2/24D01F2/28B02C17/00
Inventor 黄勇董西龙吴敏
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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