Preparation method for modified mixed cellulose ether and product obtained through method
A technology of mixing cellulose and cellulose powder is applied in the field of modified mixed cellulose ether, the preparation of mixed cellulose ether, and the preparation of modified mixed cellulose ether, which can solve the problem of low light transmittance and difficulty in making high viscosity products. , reducing the viscosity of the solution, etc., to achieve the effects of broad market prospects, excellent water retention, and fewer by-products
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Embodiment 1
[0016] 1) Preparation of lye: first configure 700 parts of mixed solvent, the ratio of the mixed solvent is isopropanol:toluene=1:4, add 400 parts of mixed solvent, 40 parts of sodium hydroxide, and 30 parts of water into the reactor, Raise the temperature to 80°C, stir the sodium hydroxide to dissolve it completely, and keep it warm for 30 minutes;
[0017] 2) Alkalization: Lower the temperature of the reactor to 30°C, add 80 parts of refined cotton powder and 1 part of starch, and spray the material with the remaining mixed solvent. After the feeding is completed, vacuumize and fill with nitrogen for 3 replacements, and then keep the reaction Stir at 28°C for 90 minutes;
[0018] 3) Etherification: after alkalization, vacuumize again, add 18 parts of propylene oxide, 58 parts of methyl chloride and 3 parts of ethylene oxide in sequence, keep the temperature of the reactor at 28°C, stir for 20 minutes, and raise the temperature of the reactor to Keep warm for 90 minutes at 4...
Embodiment 2
[0024] 1) Preparation of lye: first configure 800 parts of mixed solvent, the ratio of which is isopropanol:toluene=1:5, add 500 parts of mixed solvent, 50 parts of sodium hydroxide, and 40 parts of water into the reactor, Raise the temperature to 85°C, stir the sodium hydroxide to dissolve it completely, and keep it warm for 40 minutes;
[0025] 2) Alkalization: Lower the temperature of the reactor to 35°C, add 85 parts of refined cotton powder and 2 parts of starch, and spray the materials with the remaining mixed solvent. The reactor temperature was stirred at 25° C. for 100 minutes;
[0026] 3) Etherification: after alkalization, vacuumize again, add 20 parts of propylene oxide, 70 parts of methyl chloride and 4 parts of ethylene oxide in sequence, keep the temperature of the reactor below 24°C, stir for 25 minutes, and put the reactor into When the temperature rises to 45±1°C, 70±1°C, and 90±1°C, keep it warm for 100 minutes;
[0027] 4) Desolventization and acid adjust...
Embodiment 3
[0032] 1) Preparation of lye: first configure 900 parts of mixed solvent, the ratio of which is isopropanol:toluene=1:6, add 600 parts of mixed solvent, 60 parts of sodium hydroxide and 45 parts of water into the reactor, Raise the temperature to 90°C, stir the sodium hydroxide to dissolve it completely, and keep it warm for 50 minutes;
[0033] 2) Alkalization: Lower the temperature of the reactor to 40°C, add 88 parts of refined cotton powder and 2.5 parts of starch, and spray the material with the remaining mixed solvent. After the feeding is completed, vacuumize and replace with nitrogen for 3 times, and then keep the reaction Stir at 22°C for 110 minutes;
[0034] 3) Etherification: after alkalization, vacuumize again, add 22 parts of propylene oxide, 90 parts of methyl chloride and 5 parts of ethylene oxide in sequence, keep the temperature of the reactor below 22°C, stir for 28 minutes, and put the reactor into When the temperature is raised to 50±1°C, 75±1°C, and 92±1...
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