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A kind of preparation method of hydrophobic oil-absorbing cellulose-based airgel

A cellulose and hydrophobic technology, applied in aerogel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of low utilization rate, poor hydrophobicity, non-reusability, etc., and achieves simple and easy operation, hydrophobic oil absorption performance. Good, hydrophobic oil absorption performance can be recycled

Active Publication Date: 2021-09-21
杭州华大海天科技股份有限公司
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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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  • A kind of preparation method of hydrophobic oil-absorbing cellulose-based airgel
  • A kind of preparation method of hydrophobic oil-absorbing cellulose-based airgel

Examples

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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 airgel materials. In order to solve the problems of poor hydrophobicity, non-recyclability and low utilization rate of traditional oil-absorbing materials, a method for preparing hydrophobic and oil-absorbing cellulose-based aerogels is provided, which includes the following steps: (1) ) adding a cross-linking agent to the aqueous solution of cellulose nanofibers and ultrasonically dispersing; (2) pre-freezing treatment and freeze-drying to obtain airgel; (3) hydrophobizing treatment and drying to obtain hydrophobic oil-absorbing cellulose-based airgel glue. The invention adopts bio-based cellulose nanofibers as the main body of the adsorbent, has a wide range of raw material sources and has the advantage of being biodegradable, is harmless to the environment, and conforms to the concept of green development; adopts immersion-type hydrophobic treatment, and the method is simple and easy to operate, and the prepared cellulose The airgel-based airgel has good hydrophobic and oil-absorbing properties, can be recycled, and has a 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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Patent Type & Authority Patents(China)
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 杭州华大海天科技股份有限公司
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