Hydroxypropyl hydroxyethyl cellulose ether and preparation method thereof
A hydroxypropyl hydroxyethyl, cellulose ether technology, applied in the field of hydroxypropyl hydroxyethyl cellulose ether and its preparation, can solve the problem of high water retention, fluidity, alcohol solubility and mildew resistance, which cannot be meeting needs, etc.
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Embodiment 1
[0019] 1. Put 300kg of refined cotton into 80-mesh cellulose raw material, put it into 2100kg of inert solvent toluene, add 150kg of 50% lye to alkalize for 1 hour;
[0020] 2. Add 300kg of propylene oxide, etherify at 50°C for 2 hours, then raise the temperature to 80°C for 1 hour;
[0021] 3. Add 30kg of ethylene oxide when it drops below 25°C, and etherify at 50°C for 3 hours;
[0022] 4. Cool down to below 50°C, add an appropriate amount of glacial acetic acid to completely neutralize;
[0023] 5. After recovering the solvent from the neutralized material, add 7 times hot water to wash, separate and dry;
[0024] 6. After crushing and packaging, the finished product is obtained.
[0025] The molar substitution degree of hydroxypropyl group in the product obtained in this embodiment is 4.1, and the molar substitution degree of hydroxyethyl group is 0.5.
Embodiment 2
[0027] 1. Crush 300kg into 60-mesh cellulose raw material wood pulp foil, put it into 2700kg of inert solvent isopropanol, add 200kg of 50% lye to alkalize for 1.5 hours;
[0028] 2. Add 600kg propylene oxide and etherify at 75°C for 2 hours;
[0029] 3. Drop below 25°C and add 40kg of ethylene oxide, and etherify at 55°C for 2 hours;
[0030] 4. Cool down to below 50°C, add an appropriate amount of glacial acetic acid to neutralize;
[0031] 5. After recovering the solvent from the neutralized material, add 10 times hot water to wash, separate and dry;
[0032] 6. After crushing and packaging, the finished product is obtained.
[0033] The molar substitution degree of hydroxypropyl group in the product obtained in this embodiment is 3.9, and the substitution degree of hydroxyethyl group is 0.4.
Embodiment 3
[0035] 1. Crush 300kg to 100 mesh cellulose raw bagasse, put it into 2400kg of inert solvent dimethyl ether, add 180kg of 50% lye to alkalize for 1.5 hours;
[0036] 2. Add 900kg propylene oxide and etherify at 85°C for 1 hour;
[0037] 3. Lower the temperature below 25°C and add 300kg of ethylene oxide, etherify at 55°C for 2 hours, then raise the temperature to 75°C for 2 hours;
[0038] 4. Cool down to below 50°C, add an appropriate amount of glacial acetic acid to neutralize;
[0039] 5. After recovering the solvent from the neutralized material, add 8 times hot water to wash, separate and dry;
[0040] 6. After crushing and packaging, the finished product is obtained.
[0041] The molar substitution degree of hydroxypropyl group in the product obtained in this embodiment is 2.6, and the molar substitution degree of hydroxyethyl group is 1.5.
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