Fluorinated modified cellulose material and preparation method thereof

A technology of cellulose and nanocellulose, which is applied in coatings and other directions, can solve the problems of underutilization of nanocellulose, weakening the hydrophilicity of cellulose materials, complicated steps, etc., and achieve good biodegradability and compressive strength Good, simple operation effect

Active Publication Date: 2020-08-04
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have weakened the hydrophilicity of cellulose materials to varying degrees, and some even turned cellulose into hydrophobic materials, and at the same time made nanocellulose, a green material, not fully utilized.
In addition, these methods usually require complicated steps or consume more energy

Method used

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  • Fluorinated modified cellulose material and preparation method thereof
  • Fluorinated modified cellulose material and preparation method thereof
  • Fluorinated modified cellulose material and preparation method thereof

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preparation example Construction

[0026] A method for preparing a fluorinated modified cellulose material, comprising the steps of:

[0027] (1) The reaction vessel is replaced with nitrogen. Before the reaction, nitrogen is introduced into the reaction vessel to prevent the fluorination reaction from being disturbed by other gases, so that the effect of the fluorination reaction is better and the efficiency is higher.

[0028] Optionally, after the replacement, the pressure of the reaction vessel is less than 100 Pa, and the vacuum degree of the reaction is increased, so as to improve the efficiency of the reaction.

[0029] Optionally, the number of times of nitrogen replacement is three times, so that the effect of gas replacement in the reaction vessel is better.

[0030] (2) Feed the mixed gas containing fluorine gas into the reaction container, so that the pressure of the reaction container is 10-100KPa, so that the subsequent fluorination reaction occurs.

[0031] Optionally, the feed rate of the mixed...

Embodiment 1

[0052] The cellulose material is placed in a mixed gas containing fluorine gas and reacted for 40 minutes at a temperature of 20° C. to obtain a fluorinated modified cellulose material.

Embodiment 2

[0054] Put the micron cellulose material into the fluorination reaction kettle, and pass through 10KPaF 2 / N 2 The mixed gas (fluorine gas concentration is 1 vol%) is heated from room temperature to 50° C. at a rate of 1° C. / min and then kept at a temperature of 10 minutes to obtain a fluorinated modified nanocellulose material.

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Abstract

The invention provides a fluorinated modified cellulose material and a preparation method thereof, belonging to the technical field of cellulose material modification. The preparation method of the fluorinated modified cellulose material is to place the cellulose material in a mixed gas containing fluorine gas and react at a temperature of 0-50° C. for 10-120 minutes. The fluorinated modified cellulose material is prepared by the above preparation method. The preparation method is simple, and the prepared fluorinated modified cellulose material has good hydrophilicity, can maintain an aggregated structure in water, and has good biodegradation characteristics.

Description

technical field [0001] The invention relates to the technical field of cellulose material modification, in particular to a fluorinated modified cellulose material and a preparation method thereof. Background technique [0002] Nanocellulose (CNFs, Cellulose Nanofibrils) prepared from cellulose has the characteristics of low density, high crystallinity, high Young's modulus and strength, and good hydrophilicity. These characteristics provide it with broad application prospects. Especially with the gradual deterioration of environmental pollution and energy crisis, the characteristics of large specific surface area, good hydrophilicity and wide source of raw materials of CNFs make them have great potential application value in the direction of water treatment. [0003] However, a large number of hydrophilic groups and a large specific surface area make it have good hydrophilic properties, while its stability in water decreases. The CNFs material forms an aggregated state thr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/00C08J7/12C08J9/36
CPCC08B15/00C08B15/005C08J7/126C08J9/36C08J2301/02
Inventor 王旭李玉龙刘向阳罗龙波刘昌莉
Owner SICHUAN UNIV
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