Preparation method of super-amphiphobic nano cellulose aerogel

A nanocellulose, airgel technology, applied in the direction of coating, etc., to achieve the effect of enhancing successful and effective deposition, high reactivity

Active Publication Date: 2020-01-10
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on superhydrophobic nanocellulose aerogels has been reported extensively,

Method used

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  • Preparation method of super-amphiphobic nano cellulose aerogel
  • Preparation method of super-amphiphobic nano cellulose aerogel
  • Preparation method of super-amphiphobic nano cellulose aerogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: the preparation of nanocellulose airgel

[0034] (1) Nanocellulose (NFC) prepared by TEMPO oxidation: Nanocellulose is prepared by TEMPO oxidation. First soak the pulp board in water to obtain the slurry after thawing, take 10g of absolute dry fiber slurry and soak it in 500mL of deionized water, add TEMPO (0.16g), NaBr (1.6g) successively, and continuously mechanically stir at room temperature. It mixes well. Then 120 mL of NaClO (6.6 wt%) solution was added to start the oxidation reaction. During the reaction process, 2mol / L NaOH was used to adjust the pH value to maintain the pH value of the entire reaction system between 10-10.5 until the pH value no longer decreased, and 50 mL of ethanol was added to terminate the reaction. The slurry after the reaction was first suction filtered, then soaked in 0.1mol / L HCl solution to acidify and wash, and the steps of washing and suction filtration were repeated three times. The washed slurry was quantified to 1...

Embodiment 2

[0040] Example 2: Characterization of nanocellulose aerogels

[0041] (1) FTIR analysis: the fully dried airgel sample was pressed into thin slices in a tablet press. The FTIR spectrum of the airgel recorded by the total reflection infrared spectrometer FTIR-650, the measurement wavelength range is 4000-650cm -1 . Pure NFC was used as the control group of the experiment.

[0042] FT-IR spectra of NFC, FNA1.5 and FNSA1.5 as figure 2 shown. The aerogels prepared under different NFC concentrations had similar FTIR spectra, which were analyzed with FNA1.5 as a representative. Airgel NFC samples showed significant differences before and after CVD. at 3344cm -1 and 1730cm -1 The peaks at can be attributed to the stretching vibrations of cellulose-OH and -COOH, respectively. The C-O stretching vibration peak of NFC appears at 1056cm -1 place. The typical absorption peaks of the Si-O-Si bond of FNA1.5 and FNSA1.5 and the cellulose C-O bond are at 1130-1000 cm -1 The absorp...

Embodiment 3

[0048] Example 3: Factors Affecting the Lyophobic Properties of Nanocellulose Airgel

[0049] SEM analysis method: Spray gold on the surface of the thoroughly dried airgel sample and observe the surface morphology of the sample through a JSM-7600F field emission scanning electron microscope and take pictures. The operating voltage of the electron microscope is 5kV, and each sample selects five different The location is scanned and observed, and photos with repeated features are selected for analysis.

[0050]Contact angle measurement method: use the T200-Auto3 Plus optical contact angle tester to measure the wettability of the sample. The software of the instrument automatically calculates the contact angle value according to Young's equation. In a static mode at room temperature, 4 μL of water droplets, glycerol, ethylene glycol, castor oil, and hexadecane were dropped on the surface of the fluorinated airgel samples, and the contact angles of each sample were measured at fo...

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Abstract

The invention discloses a preparation method of a super-amphiphobic nano cellulose aerogel, and belongs to the technical field of high polymer materials. The preparation method comprises the followingsteps: by taking nanocellulose prepared by TEMPO oxidation method and nano-SiO2 particles prepared by Stober method as raw materials, preparing a mixed suspension, injecting the mixed suspension intoa mold, freezing in liquid nitrogen, and then freeze-drying under a low-temperature condition to obtain nanocellulose aerogel; adopting a chemical vapor deposition method; carrying out amphiphobic modification on the surface of the obtained nanocellulose aerogel with THFOS so as to obtain the super-amphiphobic nano cellulose aerogel. The average contact angle of the super-amphiphobic nano cellulose aerogel with water, castor oil, and hexadecane reaches 166 degrees, 157 degrees and 150 degrees, and the super-amphiphobic nano cellulose aerogel has the common characteristics of super-amphiphobicmaterials such as water resistance, and oil repellency, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and more specifically, relates to a preparation method of super amphiphobic nano-cellulose airgel. Background technique [0002] Nanocellulose airgel is obtained by replacing the water in the gel without changing the gel network and volume. It is currently known as a solid material with ultra-light weight and high porosity. With unique properties such as high specific surface area, low thermal conductivity, high adsorption, and low dielectric constant, it is considered to be the third generation of emerging airgel after inorganic aerogel and synthetic polymer aerogel. Thermal materials, adsorption materials, sustained release of drugs, sensors, energy storage and other fields are widely used. [0003] There are a large number of free hydroxyl groups at the C2, C3, and C6 positions on the surface of nanocellulose. The strong polarity of hydroxyl groups makes nanocellulose easy to absorb...

Claims

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Application Information

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IPC IPC(8): C08J9/36C08J9/28C08L1/04C08K3/36
CPCC08J9/36C08J9/28C08J2205/026C08J2301/04C08J2201/0504C08K3/36C08K2201/011
Inventor 吴伟兵冯鹤丽左克曼戴红旗
Owner NANJING FORESTRY UNIV
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