Nano-cellulose dispersing agent as well as preparation method and application of nano-cellulose dispersing agent

A nano-cellulose and dispersant technology, applied in the direction of fibrous fillers, dyed polymer organic compound treatment, inorganic compound addition, etc., can solve the problems of reducing product conductivity, destroying CNT structure, increasing product cost, etc. The effect of increasing, high dispersion efficiency and increasing concentration

Inactive Publication Date: 2015-03-25
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemical modification will destroy the structure of CNT itself and increase the cost of the product; due to the introdu...

Method used

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  • Nano-cellulose dispersing agent as well as preparation method and application of nano-cellulose dispersing agent
  • Nano-cellulose dispersing agent as well as preparation method and application of nano-cellulose dispersing agent
  • Nano-cellulose dispersing agent as well as preparation method and application of nano-cellulose dispersing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 NFC preparation and characterization

[0024] 5g of undried absolute-dry softwood pulp was thoroughly mixed with 78mg of TEMPO and 514mg of NaBr. The reaction was initiated by the addition of 30 mL of 12% NaClO and reacted with stirring at room temperature. The pH value of the system was stabilized at 10.5 by NaOH control. Until the reaction of the remaining NaClO in the system is completely completed. The reacted slurry was washed by filtration until the pH was neutral. The obtained fiber is made into a concentration of 1% and processed under pressure (5-25KPa) by a micro-fluid machine. A transparent nanocellulose (NFC) dispersion was obtained. Store the dispersion in a refrigerator at 4°C until use.

[0025] Scanning Electron Microscope (SEM) Observation: After the sample to be tested is vacuum-dried, glued to the table and vacuum-sprayed with gold, the operating condition voltage is 20kV.

[0026] The length and width of nanocellulose were characteriz...

Embodiment 2

[0030] Example 2 BN, MoS 2 Dispersion and Characterization of CNTs

[0031] First mix commercially available BN powder (Graphene supermarket, Inc.) with 10wt% NFC corresponding to the mass of BN in water. The initial concentration of BN was 5mg / mL. Dispersion is achieved by ultrasonicating the mixed solution in a tank-type ultrasonic instrument (tank-type ultrasonic instrument, ultrasonic power 200W, ultrasonic time 30h). The ultrasonicated solution was centrifuged at 3000r / min for 15min, and then the supernatant was separated. The absorption spectrum of the solution was tested on an ultraviolet spectrometer.

[0032] MoS 2 It exists in the form of ore (SPI Supplies), and the dispersion method is the same as that of BN. The amount of NFC added is MoS 2 10wt% and 50wt% of the mass. The ultrasonic time is 4h, and the centrifugal speed is 5000r / min. The absorption spectrum of the solution was tested on an ultraviolet spectrometer.

[0033] First mix CNT (Carbon Solution)...

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Abstract

The invention discloses a nano-cellulose dispersing agent as well as a preparation method and application of the nano-cellulose dispersing agent. The nano-cellulose dispersing agent is prepared by the method comprising the following steps: fully and evenly mixing 5g of undried absolute dry softwood pulp, 78mg of TEMPO and 514mg of NaBr; triggering a reaction by introducing 30mL of 12% NaClO, and carrying out the reaction while mixing at the room temperature; controlling and stabilizing the pH value of a system to be 10.5 by NaOH; finishing the reaction until the rest NaClO in the system completely reacts; washing the reacted slurry by filtering until the pH is neutral; preparing the obtained fiber into a solution with 1% of centration, and treating the solution by a microfluidizer under the pressure of 5-25KPa to obtain transparent nano-cellulose dispersion liquid; storing the dispersion liquid in a refrigerator with the temperature of 4 DEG C. NFC is taken as the dispersing agent for dispersing two-dimensional materials BN and MoS2 as well as one-dimensional material CNT, so that the dispersing method is simple. The environment-friendly aqueous solution and dispersing agent are used, the dispersion efficiency is high, and the material can be dispersed on a large scale. The NFC is green and non-toxic, so that the NFC auxiliary dispersing material not only can be applied to an energy storing device, but also has important application prospect in the field of life sciences.

Description

technical field [0001] The invention relates to the technical field of nanocellulose dispersants, in particular to a nanocellulose dispersant and its preparation method and application. Background technique [0002] Nanocellulose isolated from wood is green and non-toxic, with a diameter in the nanometer range and a length in the micron range. Because of its good mechanical, optical, and thermal properties, it has been used as a food thickener, building block material for super-strong composites, separator paper for batteries, and a substrate for electronic devices. Due to the existence of a large number of hydroxyl groups on the surface, nanocellulose is generally considered to be a hydrophilic material. However, studies have shown that the surface of cellulose also has a hydrophobic active surface due to the exposure of -CH groups. Because of its amphiphilic nature, nanocellulose has been used as an emulsifier to prepare pickering emulsions. The use of nanocellulose as a...

Claims

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Application Information

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IPC IPC(8): D21H17/70C09C1/00C09C1/44C09C3/10
Inventor 戴红旗李媛媛胡良兵祝红丽
Owner NANJING FORESTRY UNIV
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