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| Study on Lignin Hydrogel Reinforced by Dialdehyde-modified Cellulose Nanofibril and Its Temperature and Salt Tolerance |
| Received:June 23, 2021 |
| DOI：10.11981/j.issn.1000-6842.2022.01.29 |
| Key Words:lignin;hydrogel;dialdehyde cellulose nanofibril;temperature and salt tolerance;oil field plugging |
| Author Name | Affiliation | Postcode | | GENG Shao | Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 | 300457 | | ZHANG Weifeng | Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 | 300457 | | LUO Langman | Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 | 300457 | | FU Limei | Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 | 300457 | | CHEN Hongfang | Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 | 300457 | | WEN Yangbing | Tianjin Key Lab of Pulp & Paper， Tianjin University of Science & Technology， Tianjin， 300457 | 300457 |
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| Abstract: |
| The dialdehyde cellulose nanofibril （DA-CNF） was applied to the preparation of lignin hydrogel， and the interaction network of DA-CNF in the hydrogel and the condensation reaction between the aldehyde group and the phenol hydroxyl group in alkali lignin could enhance the strength of lignin hydrogel. Fourier transform infrared spectoscopy （FT-IR） results showed that poly（ethylene glycol） diglycidyl ether （PEGDGE-500） and DA-CNF reacted with lignin. Scanning electron microscope （SEM） analysis showed that adding DA-CNF rendered a porous structure of lignin hydrogel and improved its physical strength， thermal stability， and temperature and salt tolerance. The tensile strength of lignin hydrogel increased from 69.0 kPa to 175 kPa， compressive stress from 0.18 MPa to 1.5 MPa， and initial degradation temperature from 209°C to 248°C after adding 2.0% DA-CNF. The results of high temperature and high salt aging test showed after aging at 150℃ in saline water with pH value of 9 and salinity of 200000 for 20 days， the quality retention rate of DA-CNF reinforced lignin hydrogel could keep at 86.4% and it possessed good pH adaptability. Therefore， the DA-CNF reinforced lignin hydrogel has potential application in oil field plugging. |
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