Method for preparing water-soluble cellulose from waste cotton
A technology of water-soluble cellulose and waste cotton, which is applied in the direction of cellulose pulp post-treatment, fiber raw material treatment, pulp property modification, etc., can solve the problem of low recycling rate of waste cotton, achieve less environmental pollution, and reduce raw material costs , high substitution effect
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Embodiment 1
[0027] (1) Cut the waste cotton fabric into 5 mm pieces 2 square, wash and tumble dry. Weigh 10 g of sample, add it to a 600 mL beaker, add 1.5% hydrochloric acid solution, and stir at 400 r / min for 30 min at room temperature, so that the reactants are evenly dissolved or dispersed in water. Then, it was loaded into an autoclave and sealed, and the autoclave was filled to 60%. After being kept at the reaction temperature of 150°C for 3 h, the reaction product was naturally cooled to room temperature, and the reaction product was taken out and centrifuged. The separated solid cellulose powder was dried in a drying oven at 60 °C for 4 h, and dried for use.
[0028] (2) The cellulose isolated from waste cotton was converted into CMC in two steps: alkalization and etherification of cellulose. Weigh 5.0 g of cellulose powder, add it into a 500 mL Schott bottle, then add 30 mL of 40% sodium hydroxide solution, and stir at 50 °C for 20 min to obtain alkali cellulose. Weigh 1.5 g ...
Embodiment 2
[0030] (1) Cut the waste cotton fabric into 5 mm pieces 2 square, wash and tumble dry. Weigh 10 g sample, add it into a 600 mL beaker, add 1.5% hydrochloric acid solution, and stir at 400 r / min for 30 min at room temperature, so that the reactants are evenly dissolved or dispersed in water. Then, it was loaded into an autoclave and sealed, and the autoclave was filled to 60%. After being kept at the reaction temperature of 150°C for 3 h, the reaction product was naturally cooled to room temperature, and the reaction product was taken out and centrifuged. The separated solid cellulose powder was dried in a drying oven at 60 °C for 4 h, and dried for use.
[0031] (2) The cellulose isolated from waste cotton was converted into CMC in two steps: alkalization and etherification of cellulose. Weigh 5.0 g of cellulose powder, add it into a 500 mL Schott bottle, then add 30 mL of 40% sodium hydroxide solution, and stir at 50 °C for 20 min to obtain alkali cellulose. Weigh 1.5g of...
Embodiment 3
[0033] (1) Cut the waste cotton fabric into 5 mm pieces 2 square, wash and tumble dry. Weigh 10 g sample, add it into a 600 mL beaker, add 1.5% hydrochloric acid solution, and stir at 400 r / min for 30 min at room temperature, so that the reactants are evenly dissolved or dispersed in water. Then, it was loaded into an autoclave and sealed, and the autoclave was filled to 60%. After being kept at the reaction temperature of 150°C for 3 h, the reaction product was naturally cooled to room temperature, and the reaction product was taken out and centrifuged. The separated solid cellulose powder was dried in a drying oven at 60 °C for 4 h, and dried for use.
[0034] (2) The cellulose isolated from waste cotton was converted into CMC in two steps: alkalization and etherification of cellulose. Weigh 5.0 g of cellulose powder, add it into a 500 mL Schott bottle, then add 30 mL of 40% sodium hydroxide solution, and stir at 50 °C for 20 min to obtain alkali cellulose. Weigh 1.5g of...
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