A kind of preparation method of cellulose-based hydrophobic material
A cellulose and base-sparse technology, applied in the direction of coating, etc., can solve the problems of hydrophobic performance decline, instability, shedding, etc.
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Embodiment １
[0032] (1) Take 0.2g of crushed commercial bamboo pulp (bamboo pulp is selected from Sichuan Tianzhu Bamboo Resources Development Co., Ltd., and its cellulose content is ≥95wt.%), soak it in 100mL water for one day, and add the filtered product Soak in 50mL DMAc solution, filter, repeat three times. Then it was added to 20 mL of 8 wt.% LiCl / DMAc solution (the mass ratio of LiCl solid to DMAc liquid was 2:23), heated to 60°C and vigorously stirred to dissolve the cellulose.
[0033] (2) Add 0.22 mL of 2-bromoisobutyryl bromide and 0.15 mL of pyridine dropwise into the cellulose solution, react at room temperature for 24 hours, and wash repeatedly with deionized water to obtain a cellulose macromolecular initiator.
[0034] (3) Add the cellulose macroinitiator obtained in step (2) to 20mL DMSO, add 6mL 1 H ,1 H ,2 H ,2 H - Perfluorodecyl methacrylate, 0.26mL N,N,N',N,'N'' - pentamethyldiethylenetriamine ligand, 0.19g cuprous bromide catalyst, react at room temperature for ...
Embodiment 2
[0036] (1) Take 0.3g of crushed commercial wood dissolving pulp (wood dissolving pulp is selected from Fujian Qingshan Paper Co., Ltd., and its cellulose content is ≥95wt.%), and add it to 30mL of 70wt.% NMMO aqueous solution , stirred vigorously, and heated to 110°C to dissolve the cellulose to obtain a cellulose NMMO solution.
[0037] (2) Add 0.28 mL of chloroacetyl chloride and 0.30 mL of pyridine dropwise into the cellulose solution, react at room temperature for 24 hours, and wash repeatedly with deionized water to obtain a cellulose macromolecular initiator.
[0038] (3) Add the cellulose macroinitiator obtained in step (2) to 30mL DMSO, add 5mL 1 H ,1 H ,2 H ,2 H - Perfluorooctyl methacrylate, 0.3g 2,2-bipyridine ligand, 0.27g cuprous bromide catalyst, react at room temperature for 1 day, filter, and dry to obtain a cellulose-based hydrophobic material.
Embodiment 3
[0040] (1) Take 0.2g of crushed commercial wood dissolving pulp (wood dissolving pulp is selected from Fujian Qingshan Paper Co., Ltd., and its cellulose content is ≥95wt.%), soak in 100mL water for one day, and filter the product Add to 50mL DMAc solution to soak, filter, repeat three times. Then it was added to 20 mL of 8 wt.% LiCl / DMAc solution (the mass ratio of LiCl solid to DMAc liquid was 2:23), heated to 60°C and vigorously stirred to dissolve the cellulose.
[0041] (2) Add 0.23 mL of chloroacetyl chloride and 0.25 mL of pyridine dropwise into the cellulose solution, react at room temperature for 24 hours, and wash repeatedly with deionized water to obtain a cellulose macromolecular initiator.
[0042] (3) Add the cellulose macroinitiator obtained in step (2) to 20mL DMF, add 6mL decyl acrylate, 0.19g 2,2-bipyridyl ligand, 0.18g cuprous bromide catalyst, and React for 1 day, filter, and dry to obtain a cellulose-based hydrophobic material.
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