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Preparation method of hydrophobic and oleophylic cellulose based aerogel

A cellulose and hydrophobic technology, applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of non-reusable, low utilization rate, poor hydrophobicity, etc., achieve hydrophobic and oil-absorbing properties and can be recycled, method Simple and easy to operate, good hydrophobic and oil-absorbing performance

Active Publication Date: 2019-08-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of poor hydrophobicity, non-recyclability and low utilization rate of traditional oil-absorbing materials, the present invention provides a method for preparing hydrophobic and oil-absorbing cellulose-based aerogels. Harmless, in line with the concept of green development; the prepared cellulose-based airgel has good hydrophobic and oil-absorbing properties and can be recycled

Method used

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  • Preparation method of hydrophobic and oleophylic cellulose based aerogel
  • Preparation method of hydrophobic and oleophylic cellulose based aerogel

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1) Dilute the commercially available cellulose nanofiber solution with water to a 1wt% concentration dispersion, and ultrasonically disperse at 45°C for 9 minutes until the cellulose nanofibers are uniformly dispersed in deionized water, according to the solid content of 10 / 0.5 (cellulose Nanofiber dry weight / crosslinking agent dry weight=10 / 0.5) Add crosslinking agent butane tetracarboxylic acid in proportion, maintain water temperature at 45°C, and continue ultrasonic dispersion for 65 minutes until the mixture is uniformly dispersed;

[0031] (2) Pour the uniformly dispersed mixture into a specific mold, place it in the refrigerator for pre-freezing at -18°C for about 12 hours, and freeze-dry it at -76°C for about 36 hours after the pre-freezing to obtain dry cross-linked cellulose nanofibers Aerogel;

[0032] (3) Configure a hexamethylene diisocyanate acetone solution with a concentration of 0.2wt% as a hydrophobic treatment agent, and soak the dried cellulose nano...

Embodiment 2

[0036] (1) Dilute the commercially available cellulose nanofiber solution with water to a 2wt% concentration dispersion, and ultrasonically disperse at 35°C for 10 minutes until the cellulose nanofibers are uniformly dispersed in deionized water, according to the solid content of 5 / 1 (cellulose Dry weight of nanofibers / dry weight of cross-linking agent = 5 / 1) Add the cross-linking agent epichlorohydrin in proportion, maintain the water temperature at 35°C, and continue ultrasonic dispersion for 120 minutes until the mixture is uniformly dispersed; the ultrasonic power is 100W, and the ultrasonic frequency 60KHz;

[0037] (2) Pour the uniformly dispersed mixture into a specific mold (a small glass bottle with a diameter of 1.3 cm), place it in the refrigerator for about 12 hours at -18°C, and freeze-dry it at -76°C for about 36 hours after the pre-freezing is completed. Obtain dry cellulose nanofiber cross-linked airgel;

[0038](3) configure the heptadecafluorodecyltriethoxys...

Embodiment 3

[0040] (1) Dilute the commercially available cellulose nanofiber solution with water to a 0.5wt% concentration dispersion, and ultrasonically disperse at 50°C for 5 minutes until the cellulose nanofibers are uniformly dispersed in deionized water, according to the solid content of 10 / 1 (fiber Dry weight of plain nanofibers / dry weight of cross-linking agent=10 / 1) Add the cross-linking agent butane tetracarboxylic acid in proportion, maintain the water temperature at 50°C, and continue ultrasonic dispersion for 30 minutes until the mixture is uniformly dispersed; the ultrasonic power is 500W, Ultrasonic frequency is 20KHz;

[0041] (2) Pour the uniformly dispersed mixture into a specific mold, place it in the refrigerator for pre-freezing at -18°C for about 12 hours, and freeze-dry it at -76°C for about 36 hours after the pre-freezing to obtain dry cross-linked cellulose nanofibers Aerogel;

[0042] (3) Diphenylmethane diisocyanate acetone solution with a concentration of 4wt% ...

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Abstract

The invention relates to the technical field of aerogel materials and provides a preparation method of a hydrophobic and oleophylic cellulose based aerogel in order to solve the problems of poor hydrophobicity, unreusability and low utilization rate of convectional oleophylic materials. The preparation method comprises the following steps: (1) adding of a crosslinking agent to an aqueous solutionof cellulose nanofibers, and ultrasonic dispersion; (2) pre-freezing treatment, and freeze-drying for obtaining an aerogel; and (3) hydrophobization treatment, and drying for obtaining the hydrophobicand oleophylic cellulose based aerogel. The bio-based cellulose nanofibers are used as an adsorbent main body, and have the advantages of wide sources, biodegradability, harmlessness to the environment, and conforming to the green development concept; the method adopting immersion-type hydrophobic treatment is simple, and is easy to operate; and the obtained cellulose based aerogel has the advantages of good hydrophobic and oleophylic performances, reusability and high resource utilization rate.

Description

technical field [0001] The invention relates to the technical field of airgel materials, in particular to a method for preparing hydrophobic and oil-absorbing cellulose-based airgel. Background technique [0002] In recent years, with the development of industrialization, the problem of oil spills has become increasingly prominent and has become the main source of marine pollution. Marine water pollution, as one of the most serious environmental problems at present, has attracted widespread attention and action. During the decades of dealing with oil spills, a variety of measures have been implemented and improved, mainly including the most basic filtration, extraction, and chemical degradation, sorbent adsorption and other treatment methods. Among them, although the methods such as filtration and extraction are simple in experiment, they are time-consuming and labor-intensive in actual operation, and the efficiency is not high; while the cycle required for chemical degradat...

Claims

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Application Information

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IPC IPC(8): C08J9/36C08J9/28C08J3/24C08L1/02B01J20/24B01J20/28B01J20/30B01J13/00
CPCB01J13/0091B01J20/24B01J20/28047C08J3/24C08J9/28C08J9/36C08J2201/0484C08J2301/02
Inventor 王旭马猛徐琳陈思施燕琴何荟文
Owner ZHEJIANG UNIV OF TECH
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