A novel preparation method of oxidized regenerated cellulose product
A technology of regenerated cellulose and type A cellulose, which is applied in chemical post-treatment of cellulose/protein rayon, rayon made of viscose, etc. Uncontrollable degree of oxidation, uneven degree of oxidation and other problems, to achieve the effect of fast solidification, stable fineness, and reliable product performance
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Embodiment 1
[0032] 1) Pretreat the cellulose product by immersing the wood pulp in a sodium hydroxide solution with a concentration of 200 g / L at a temperature of 40°C, and then press and crush it with a press to remove hemicellulose and the impurities on the surface of the fiber, reaching a cellulose content of 26% in the resulting alkali cellulose product, an alkali content of 15%, and a density of 150 kilograms per cubic meter;
[0033] 2), adding a concentration of 100 grams per liter of sodium hydroxide pre-alkaline solution to further expand the cellulose. After adding alkali, the content of cellulose A was reduced to 20%. Add 32% carbon disulfide of the weight of the first cellulose into the system to carry out yellowing reaction. The initial temperature of the yellowing reaction is 12°C, the final temperature is 26°C, and the yellowing time is 120 minutes;
[0034] 3), the sodium cellulose sulfonate obtained in the previous step was further dissolved with 100 g / L sodium hydroxide ...
Embodiment 2
[0042] 1) Pretreat the cellulose product by immersing the cotton pulp in a sodium hydroxide solution with a concentration of 300 g / L at a temperature of 60°C, and then press and pulverize it with a press to remove hemicellulose and impurities on the surface of the fiber, reaching a 32% cellulose content in the resulting alkali cellulose product, 18% alkali content, and a density of 200 kilograms per cubic meter;
[0043] 2), adding a concentration of 130 grams per liter of sodium hydroxide pre-alkaline solution to further expand the cellulose. After adding alkali, the content of cellulose A decreased to 22%. Add 36% carbon disulfide of the weight of the first cellulose into the system to carry out yellowing reaction. The initial temperature of the yellowing reaction is 20°C, the final temperature is 34°C, and the yellowing time is 60 minutes;
[0044] 3), the sodium cellulose sulfonate obtained in the previous step was further dissolved with 130 g / L of sodium hydroxide solut...
Embodiment 3
[0052] 1) Bamboo pulp is immersed in a sodium hydroxide solution with a concentration of 250 g / liter at a temperature of 50°C to pretreat the cellulose product, and then squeezed and crushed by a press to remove hemicellulose and the impurities on the surface of the fiber, reaching a cellulose content of 29% in the resulting alkali cellulose product, an alkali content of 16.5%, and a density of 175 kg / m3;
[0053] 2), adding a concentration of 115 grams per liter of sodium hydroxide pre-alkalinization solution to further expand the cellulose. After adding alkali, the content of cellulose A decreased to 21%. Add 34% carbon disulfide of the weight of the first cellulose into the system to carry out yellowing reaction. The initial temperature of the yellowing reaction is 16°C, the final temperature is 30°C, and the yellowing time is 90 minutes;
[0054] 3), the sodium cellulose sulfonate obtained in the previous step was further dissolved with a 115 g / L sodium hydroxide solutio...
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