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Method for hydrophobic modification of nanocrystalline cellulose

A nano-crystal, cellulose technology, applied in the field of functional nano-materials, can solve the problems of high industrialization cost, harsh reaction conditions, complex and other problems, and achieve the effects of excellent deformation resistance, reduced agglomeration, and good hydrophobicity.

Active Publication Date: 2016-09-21
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the past research, these research methods have certain deficiencies, and some require complex chemical reaction pre-treatment to destroy the structure of the fiber, and most of the modification methods must be carried out in organic solvents. , the reaction conditions are harsh, the reaction route is complicated, and the industrialization cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Ultrasonic disperse 1 gram of rod-shaped nanocrystalline cellulose with a diameter of 10 nm prepared from cotton fibers in 100 grams of deionized water at a frequency of 20 KHz, and then add 0.01 gram of FeCl 3 .6H 2 O and 0.04 gram of tannic acid, at 25°C, stir the reaction with 500r / min stirring speed for 0.1 hour, then use 0.1mol / L NaOH solution to adjust the pH value of the dispersed liquid to 7.6, at 25°C Next, continue to stir for 1 hour, centrifuge the dispersed liquid after the reaction and discard the supernatant to obtain the water-insoluble suspension of the lower layer, and wash the suspension with ethanol and deionized water respectively, and then centrifuge again, repeat 3 Second, freeze-dry the precipitate at -80°C for 5 hours at a pressure of 10 Pa to obtain nanocrystalline cellulose modified with an iron-tannic acid film layer; Ultrasonic dispersion of cellulose in a mixed solution of 100mL ethanol and water containing 0.202g of n-dodecylmercaptan, the...

Embodiment 2

[0023] Ultrasonic dispersion of 1 gram of elliptical nanocrystalline cellulose with a diameter of 50 nm prepared from bamboo fiber in 100 grams of deionized water, the frequency of the ultrasonic wave is 50KHz, and then 0.04 grams of FeCl 3 .6H 2 O and 0.16 g of tannic acid, at 40°C, stirred at a stirring speed of 1000r / min for 1 hour, then adjusted the pH value of the dispersed liquid to 9.5 with 0.1mol / L of NaOH solution, and at 40°C Next, continue stirring for 1 hour, centrifuge the dispersed solution after the reaction, discard the supernatant to obtain a water-insoluble suspension in the lower layer, wash the suspension with ethanol and deionized water, and then centrifuge and separate again, repeat Three times, the suspension was freeze-dried at a pressure of 80 Pa and -40°C for 20 hours to obtain nanocrystalline cellulose modified with an iron-tannic acid film layer; the nanocrystalline cellulose modified with the iron-tannic acid film layer obtained above Microcrystal...

Embodiment 3

[0025] 1 gram of elliptical nanocrystalline cellulose with a diameter of 100 nm prepared from hemp fiber is ultrasonically dispersed in 100 grams of deionized water, the frequency of the ultrasonic wave is 50KHz, and then 0.2 grams of FeCl are added in turn. 3 .6H 2 O and 0.8 g of tannic acid, at 30°C, stirred at a stirring speed of 1500r / min for 1 hour, and then adjusted the pH value of the dispersed liquid to 9.5 with 0.1mol / L NaOH solution, and at 30°C Next, continue stirring for 1 hour, centrifuge the dispersed solution after the reaction, discard the supernatant to obtain a water-insoluble suspension in the lower layer, wash the suspension with ethanol and deionized water, and then centrifuge and separate again, repeat Three times, the suspension was freeze-dried at a pressure of 60Pa and -60°C for 15 hours to obtain nanocrystalline cellulose modified with an iron-tannic acid film layer; the nanocrystalline cellulose modified with the iron-tannic acid film layer obtained ...

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Abstract

The invention discloses a method for hydrophobic modification of nanocrystalline cellulose and belongs to the technical field of functional nano materials. According to the method, nanocrystalline cellulose is dispersed in aqueous solution, dispersion liquid is treated with ferric chloride and tannin, centrifugal separation is conducted to obtain iron-tannin membrane modified nanocrystalline cellulose, then the iron-tannin membrane modified nanocrystalline cellulose is dispersed in an ethyl alcohol and water mixed solution containing low-surface-energy substance, centrifugal layering is conducted on mixed liquid obtained after reaction, and then freeze drying is conducted to obtain the nanocrystalline cellulose with a hydrophobization modified surface. The prepared hydrophobization modified nanocrystalline cellulose can be uniformly dispersed in various polar solvents, product diversity is high, preparing process is simple, environment pollution is avoided, and cost is low. The hydrophobization modified nanocrystalline cellulose is suitable for large-scale production and has broad application prospects in fields including nano-composite reinforcing materials and biomedical materials.

Description

technical field [0001] The invention relates to a method for hydrophobizing and modifying nano-microcrystalline cellulose, which belongs to the technical field of functional nanometer materials. Background technique [0002] As a natural biomaterial, nano-microcrystalline cellulose has been proven to be used in regenerative medicine, optical applications, automotive applications, synthetic materials and other fields due to its highly crystalline structure, unique aspect ratio and large specific surface area. In addition, nanocellulose has high tensile strength and high Young's modulus, and is a good reinforcing filler for various synthetic materials. However, due to the numerous hydroxyl groups on the surface of nanocellulose, it cannot be well dissolved and dispersed in weak polar solvents, non-aqueous media and polymer media, which greatly limits its scope of application. Therefore, it is necessary to The nanocellulose is modified by chemical methods to expand its applica...

Claims

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Application Information

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IPC IPC(8): C08B15/05
CPCC08B15/05
Inventor 顾绍金卜怿明杨玲黄菁菁徐卫林杨红军周应山
Owner WUHAN TEXTILE UNIV
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