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Super-hydrophobic modification method of nanocellulose

A technology of nanocellulose and superhydrophobic modification, which is applied in the field of superhydrophobic modification of nanocellulose, can solve the problems of limiting the development speed of nanocellulose and decreasing the stiffness of nanocellulose materials, and achieves enhanced superhydrophobicity, The effect of strengthening long hydrophobic chains and loose structure

Inactive Publication Date: 2021-12-10
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of a large number of hydrophilic groups, the nanocellulose material can easily absorb moisture in the environment, resulting in a decrease in stiffness, which limits the development speed of nanocellulose.

Method used

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  • Super-hydrophobic modification method of nanocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of nanocellulose: Weigh 30g of dry bleached sulfate hardwood pulp, soak it in 5% NaOH solution for 12 hours, carry out dispersing (20000r), PFI beating (4000r), washing with distilled water and centrifuging three times (8000r) / min, 20min), freeze-dried for 48h. 5 g of the freeze-dried pulp sample was weighed, and 95 ml of distilled water was added to obtain a cellulose suspension with a concentration of 5%. 0.5 g of NaBr, 0.06 g of TEMPO, and 20 mmol of NaClO were added in sequence, and 0.1 mol / L of HCl and 0.1 mol / L of NaOH were added dropwise to control the pH of the reaction system to remain constant at 10. The slurry sample was then placed into a tank-type ultrasonic wave for ultrasonic vibration treatment for 3 hours, ethanol was added to terminate the reaction, centrifuged and washed three times (8000 r / min, 15 min), and freeze-dried to obtain nanocellulose powder;

[0027] (2) Preparation of hydrophobic nanocellulose particles: weigh 2g of nanoc...

Embodiment 2

[0030] (1) Preparation of nanocellulose: Weigh 30g of dry bleached sulfate hardwood pulp, soak it in 8% NaOH solution for 12 hours, carry out dispersing (20000r), PFI beating (4000r), washing with distilled water and centrifuging three times (8000r) / min, 20min), freeze-dried for 48h. 5 g of the freeze-dried pulp sample was weighed, and 95 ml of distilled water was added to obtain a cellulose suspension with a concentration of 5%. 0.5 g of NaBr, 0.06 g of TEMPO, and 40 mmol of NaClO were successively added, and 0.1 mol / L of HCl and 0.1 mol / L of NaOH were added dropwise to control the pH of the reaction system to remain constant at 10. The slurry sample was then placed into a tank-type ultrasonic wave for ultrasonic vibration treatment for 3 hours, ethanol was added to terminate the reaction, centrifuged and washed three times (8000 r / min, 15 min), and freeze-dried to obtain nanocellulose powder;

[0031] (2) Preparation of hydrophobic nanocellulose particles: weigh 1g of nano...

Embodiment 3

[0034](1) Preparation of nanocellulose: Weigh 30g of dry bleached sulfate hardwood pulp, soak it in 10% NaOH solution for 12 hours, carry out dispersing (20000r), PFI beating (4000r), washing with distilled water and centrifuging three times (8000r) / min, 20min), freeze-dried for 48h. 5 g of the freeze-dried pulp sample was weighed, and 95 ml of distilled water was added to obtain a cellulose suspension with a concentration of 5%. 0.5 g of NaBr, 0.06 g of TEMPO, and 60 mmol of NaClO were added in sequence, and 0.1 mol / L of HCl and 0.1 mol / L of NaOH were added dropwise to control the pH of the reaction system to remain constant at 10. The slurry sample was then placed into a tank-type ultrasonic wave for ultrasonic vibration treatment for 3 hours, ethanol was added to terminate the reaction, centrifuged and washed three times (8000 r / min, 15 min), and freeze-dried to obtain nanocellulose powder;

[0035] (2) Preparation of hydrophobic nanocellulose particles: weigh 1g of nanoc...

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Abstract

The invention relates to super-hydrophobic modification of nanocellulose, and provides a super-hydrophobic modification method of nanocellulose. The method comprises the following steps: preparing nanocellulose with different carboxyl contents by utilizing a method of combining a TEMPO / NaClO / NaBr oxidation system and ultrasonic oscillation, and selecting octadecylamine with low surface energy as a hydrophobic modifier, wherein a hydrophobic long chain can be grafted on the surface of the nanocellulose by carboxyl in the nanocellulose and amino in the octadecylamine through complexation reaction; and selecting an adhesive substance polydopamine, and coating the surface of the modified nanofiber with the selected substrate, so that not only can an octadecylamine long chain grafted with the nanocellulose be protected, but also free octadecylamine in a system can be adsorbed on the surface of the nanocellulose. The prepared hydrophobic nano cellulose film is applied to the fields of oil-water separation, waterproof films and the like.

Description

technical field [0001] The invention relates to the field of superhydrophobic modification of nanocellulose, in particular to a superhydrophobic modification method of nanocellulose. Background technique [0002] Nanocellulose refers to cellulose with a diameter between 1 and 100nm. It not only has the characteristics of cellulose, such as: renewable, degradable, good biocompatibility, strong chemical stability, etc.; High aspect ratio, high elastic modulus, high specific surface area, etc. Generally, the preparation methods of nanocellulose include physical grinding method, chemical hydrolysis method, biological enzymatic hydrolysis method, chemical physical method, etc., wherein, chemical physical method refers to the oxidation of the hydroxyl group on the C6 position in the cellulose glucose unit by TEMPO oxidation method first. Carboxyl group, and then assisted by ultrasonic oscillation to prepare nanocellulose. The nanocellulose prepared by this method not only has the...

Claims

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Application Information

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IPC IPC(8): C08B15/04C08B15/06C08G73/06
CPCC08B15/04C08B15/06C08G73/0672
Inventor 惠岚峰王凌媛王晓迪王宇耿合斌
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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