Preparation method for high-viscosity, temperature-resisting and low-filtration-loss polyanionic cellulose
A technology of polyanion and cellulose, which is applied in the field of preparation of polyanion cellulose, can solve the problems of polyanion cellulose such as low viscosity, high fluid loss, insufficient temperature resistance, etc., and achieve simple and easy modification method, high filtration Increased loss and excellent performance
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Embodiment 1
[0026] A method for preparing polyanionic cellulose with high viscosity, temperature resistance and low fluid loss. The specific operation method is as follows:
[0027] (1) Alkalization of cellulose: 1500g of 40% (w / w) sodium hydroxide aqueous solution and 1800g of 92% (v / v) ethanol aqueous solution are put into the kneader and mixed together in the kneader After cooling for 20 minutes, the temperature is lowered to 15° C., and 1000 g of refined cotton cellulose that has been preliminarily pulverized is put into the kneader, and alkali cellulose is obtained after an alkalinization reaction for 1.5 hours.
[0028] (2) Etherification of cellulose: 1100g of chloroacetic acid (prepared as a 50% aqueous solution) and alkali cellulose are mixed by spraying within 20-30min, etherification is reacted at 50℃ for 1h, and then the temperature is raised Etherification reaction at 75°C for 1h.
[0029] (3) Crosslinking of cellulose: Dissolve 7.5g of N,N-dimethylacrylamide and 0.0075g of potassi...
Embodiment 2
[0032] A method for preparing polyanionic cellulose with high viscosity, temperature resistance and low fluid loss. The specific operation method is as follows:
[0033] (1) Alkalization of cellulose: 1500g of 50% (w / w) sodium hydroxide aqueous solution and 1800g of 92% (v / v) ethanol aqueous solution are put into the kneader and mixed together in the kneader After cooling for 20 minutes, the temperature is lowered to 40° C., 1000 g of refined cotton cellulose that has been preliminarily pulverized is put into the kneader, and alkali cellulose is obtained after an alkalinization reaction for 1.5 hours.
[0034] (2) Etherification of cellulose: 1300g of chloroacetic acid (prepared as a 50% aqueous solution) and alkali cellulose are mixed by spraying within 20-30min, and the etherification reaction is carried out at 50℃ for 1h, and then the temperature is raised. Etherification reaction at 75°C for 2h.
[0035] (3) Cross-linking of cellulose: Dissolve 15g of N,N-dimethylacrylamide and ...
Embodiment 3
[0038] A method for preparing polyanionic cellulose with high viscosity, temperature resistance and low fluid loss. The specific operation method is as follows:
[0039] (1) Alkalization of cellulose: 1500g of 45% (w / w) sodium hydroxide aqueous solution and 1800g of 92% (v / v) ethanol aqueous solution are put into the kneader and mixed together in the kneader After cooling for 20 minutes, the temperature is lowered to 30° C., and the preliminarily pulverized 1000 g of refined cotton cellulose is put into the kneader, and alkali cellulose is obtained after 1.5 hours of alkalization.
[0040] (2) Etherification of cellulose: Mix 1200g of chloroacetic acid (prepared as an aqueous solution with a concentration of 50%) and alkali cellulose within 20-30 minutes by spraying, and etherify at 50°C for 1 hour, and then heat up Etherification reaction at 75℃ for 1.5h.
[0041] (3) Cross-linking of cellulose: 10g of N,N-dimethylacrylamide and 0.015g of potassium persulfate dissolved in 95% (v / v)...
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