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Preparation process of nano cellulose whisker

A nanocellulose and preparation technology, which is applied in the field of preparation technology of nanocellulose whiskers, can solve the problems of long processing time, environmental pollution, excessive degumming, etc., to facilitate processing, improve dispersibility, and reduce use volume effect

Inactive Publication Date: 2015-06-03
HAO YU ADDITION AGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The degumming process is a very important step in the preparation of nanocellulose whiskers. At present, the commonly used degumming method in industry is chemical degumming. It takes a long time, consumes a lot of energy, and pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation process for nanocellulose whiskers, comprising the following steps:

[0022] (1) Sample preparation

[0023] Mulberry bast is obtained from the plant bast peeled off from the branches of mulberry trees without being scraped and dried in the sun;

[0024] (2) Pretreatment, remove green skin

[0025] Take the washed and dried mulberry bast, boil it with a sodium hydroxide solution with a concentration of 10g / L at 90-100°C for 2 hours, and then wash off the softened green bark on the surface of the mulberry with a large amount of water;

[0026] (3) Flash explosion - ultrasonic degumming

[0027] Put the washed mulberry bark into the room temperature, the concentration is 4%, and the NaOH solution with bath ratio 1:15 is pre-soaked for 20 hours. : Pressure 1MPa, pressure holding time 10min, ultrasonic treatment after flash explosion treatment, the operating conditions of ultrasonic treatment are: temperature 40°C, power 60W, frequency 28KHz, wash with wate...

Embodiment 2

[0035] A preparation process for nanocellulose whiskers, comprising the following steps:

[0036] (1) Sample preparation

[0037] Mulberry bast is obtained from the plant bast peeled off from the branches of mulberry trees without being scraped and dried in the sun;

[0038] (2) Pretreatment, remove green skin

[0039] Take the washed and dried mulberry bast, boil it with a sodium hydroxide solution with a concentration of 10g / L at 90-100°C for 2 hours, and then wash off the softened green bark on the surface of the mulberry with a large amount of water;

[0040] (3) Flash explosion - ultrasonic degumming

[0041] Put the mulberry bark that has been washed away at room temperature, with a concentration of 6%, and a NaOH solution with a bath ratio of 1:25 to pre-soak for 30 hours. After the pre-soaking is completed, wash with water, and then carry out flash explosion pretreatment (pressure 2MPa, pressure holding time 5min) , perform ultrasonic treatment after flash explosion...

Embodiment 3

[0049] A preparation process for nanocellulose whiskers, comprising the following steps:

[0050] (1) Sample preparation

[0051] Mulberry bast is obtained from the plant bast peeled off from the branches of mulberry trees without being scraped and dried in the sun;

[0052] (2) Pretreatment, remove green skin

[0053] Take the washed and dried mulberry bast, boil it with a sodium hydroxide solution with a concentration of 10g / L at 90-100°C for 2 hours, and then wash off the softened green bark on the surface of the mulberry with a large amount of water;

[0054] (3) Flash explosion - ultrasonic degumming

[0055] The mulberry bark that has been washed off is put into room temperature, and the concentration is 5%, and the NaOH solution with a bath ratio of 1:20 is pre-soaked for 25h. After the pre-soaking is completed, it is washed with water, followed by flash explosion pretreatment (pressure 1.5MPa, pressure holding time 8min ), carry out ultrasonic treatment (temperature...

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PUM

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Abstract

The invention relates to a preparation process of a nano cellulose whisker. The preparation process comprises the following steps: (1) preparing a test sample; (2) carrying out pretreatment, and removing green bark; (3) carrying out flash explosion-ultrasonic degumming; (4) carrying out bleaching; and (5) preparing a mulberry bark nano cellulose whisker suspension solution. By adopting a flash explosion-ultrasonic degumming process, compared with those when a chemical degumming process is adopted, the use amount of a chemical reagent can be reduced, consumed energy is reduced, the environment pollution is avoided, the dispersion property of the mulberry bark nano cellulose whisker can be improved, and the subsequent processing can be relatively well facilitated.

Description

technical field [0001] The invention relates to the technical field of nanocellulose, in particular to a preparation process of nanocellulose whiskers. Background technique [0002] Cellulose is the most abundant biodegradable polymer material in nature. With the severe shortage of resources and people's increasing emphasis on environmental protection, this cheap and abundant green renewable resource is effectively used, and new technologies are used to reassemble and modify cellulose molecules and whiskers in the microscopic field, and develop New fine chemical products with excellent performance are of great significance. According to their morphology, nanocellulose can be divided into three categories: nanocellulose crystals (whiskers), nanocellulose composites and nanocellulose fibers. Nanocellulose whiskers (NCW) have a length of 10-1000 nm, a cross-sectional size of only 5-20 nm, and a ratio of length to cross-sectional size (aspect ratio) of 1-100. Nanocellulose wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21B1/02D21B1/36D21C9/12
CPCD21C1/06D21B1/36D21C9/12
Inventor 尹立华
Owner HAO YU ADDITION AGENT
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