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Method for preparing nanocellulose from low-strength ultrasonic-assisted amino acid ionic liquid and application of nanocellulose

A technology of nano-cellulose and ionic liquids, applied in fiber raw materials, fiber raw material processing, raw material separation, etc., can solve the problems of high energy consumption of physical and mechanical methods, long time consumption of biological methods, high cost of chemical methods, etc., and achieve simple equipment and operation , good chemical stability, rich source of raw materials

Inactive Publication Date: 2017-01-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for preparing NCC can be divided into physical mechanical method, chemical method and biological method as a whole, but there are some shortcomings, such as high energy consumption of physical mechanical method, high cost of chemical method, and long time consumption of biological method, etc. Further development of NCC

Method used

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  • Method for preparing nanocellulose from low-strength ultrasonic-assisted amino acid ionic liquid and application of nanocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing nanocellulose from amino acid ionic liquids assisted by low-intensity ultrasonic waves in this embodiment, the specific preparation steps are as follows:

[0032] (1) Pretreatment of amino acid ionic liquid: uniformly mix crushed 30-mesh corn stalk and glycylic amino acid ionic liquid at 60° C. in a mass ratio of 1%, and obtain the mixture after 1.0 hour of treatment;

[0033] (2) Ultrasonic treatment: the solid-liquid mixture obtained in step (1) was placed in an ultrasonic water bath for ultrasonic treatment for 10 minutes at an ultrasonic power of 50W, and the temperature was controlled at 25°C;

[0034] (3) Post-treatment: centrifuge the mixture obtained in step (2) at 3000 rpm for 10 min; finally freeze-dry at -60° C. for 12 hours to obtain solid nanocellulose.

[0035] The performance index of the nanocellulose prepared in this example: yield: 38.21%; diameter: 65-284 nm; length: 223-1286 nm, crystallinity: 82.93%.

Embodiment 2

[0037] A method for preparing nanocellulose from amino acid ionic liquids assisted by low-intensity ultrasonic waves in this embodiment, the specific preparation steps are as follows:

[0038] (1) Pretreatment of amino acid ionic liquid: uniformly mix crushed 40-mesh corn stalk and glycylic amino acid ionic liquid at 60° C. in a mass ratio of 2%, and obtain the mixture after 2.0 hours of treatment;

[0039] (2) Ultrasonic treatment: the solid-liquid mixture obtained in step (1) was placed in an ultrasonic water bath for ultrasonic treatment for 20 minutes at an ultrasonic power of 50W, and the temperature was controlled at 25°C;

[0040] (3) Post-treatment: the mixture obtained in step (2) was centrifuged at 4000 rpm for 10 min; and finally freeze-dried at -60° C. for 12 hours to obtain solid nanocellulose.

[0041] The performance index of the nanocellulose prepared in this example: yield: 38.03%; diameter: 55-242 nm; length: 197-1186 nm, crystallinity: 83.17%.

Embodiment 3

[0043] A method for preparing nanocellulose from amino acid ionic liquids assisted by low-intensity ultrasonic waves in this embodiment, the specific preparation steps are as follows:

[0044] (1) Pretreatment of amino acid ionic liquid: uniformly mix crushed 50-mesh corn stalk and lysine amino acid ionic liquid at 70° C. in a mass ratio of 3%, and obtain the mixture after 2.0 hours of treatment;

[0045] (2) Ultrasonic treatment: the solid-liquid mixture obtained in step (1) was placed in an ultrasonic water bath for ultrasonic treatment for 30 minutes at an ultrasonic power of 100W, and the temperature was controlled at 25°C;

[0046] (3) Post-treatment: centrifuge the mixture obtained in step (2) at 5000 rpm for 10 min; finally freeze-dry at -50° C. for 12 hours to obtain solid nanocellulose.

[0047] The performance index of the nanocellulose prepared in this example: yield: 36.42%; diameter: 48-209 nm; length: 163-981 nm, crystallinity: 81.79%.

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Abstract

The invention discloses the technical field of nanocellulose and particularly discloses a method for preparing nanocellulose from low-strength ultrasonic-assisted amino acid ionic liquid and application of the nanocellulose. The method includes the following operation steps that smashed corn straw and amino acid ionic liquid are evenly mixed at a certain temperature and processed for a certain period of time to obtain a mixture; the solid and liquid mixture is placed in an ultrasonic water bath instrument for ultrasonic treatment; the processed mixture is subjected to centrifugal separation and drying to obtain solid nanocellulose. The nanocellulose prepared in the method is rich in raw material source, simple in equipment, easy to operate and suitable for large-scale production. The prepared NCC is uniform in grain size, good in performance, high in yield and capable of being used in the field of flexible electronic display screens.

Description

technical field [0001] The invention belongs to the technical field of nanocellulose, and in particular relates to a method for preparing nanocellulose from an amino acid ionic liquid assisted by low-intensity ultrasonic waves and its application. Background technique [0002] Nanocellulose (NCC) is a cellulose crystal with at least one dimension reaching 1-100 nm, which can be dispersed in water to form a stable suspension. NCC is a renewable nanomaterial, which is the frontier and hotspot of current research. It has some superior properties, such as unique optical properties, rheological properties and mechanical properties, as well as the characteristics of light weight, degradability, biocompatibility and regeneration of biological materials, which make it have a wide range of application values. It can be used as a reinforcing material in nanocomposite materials, and in many fields such as biomedicine, paper packaging, food additives, and electronic devices. [0003] ...

Claims

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Application Information

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IPC IPC(8): D21B1/30D21C1/04
CPCD21B1/303D21C1/04
Inventor 杨仁党程峥周晓明
Owner SOUTH CHINA UNIV OF TECH
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