Carboxylated cellulose nanofiber and preparation method thereof
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United States of America Patent
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May 25, 2023
app pub date -
Dec 20, 2022
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Dec 24, 2021
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Disclosed herein is a carboxylated cellulose nanofiber and a preparation method thereof. The method includes: mixing choline chloride, citric acid and water at 60-100° C. for 15-60 min to obtain a hydrated multi-carboxylic acid deep eutectic solvent (H-DES); mixing the H-DES and cellulose for hydrolysis-esterification reaction at 120-130° C. for 2-3 h to obtain a carboxylated cellulose; and mixing the carboxylated cellulose and water for nano-fibrillation to obtain the carboxylated cellulose nanofiber.
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