Preparation method of polyether macromonomer for polycarboxylate water reducer
A technology of polyether macromonomer and water reducing agent, which is applied in the field of synthesis of methallyl atactic polyether, and achieves the effects of high effective content, simple operation and stable quality
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Embodiment 1
[0030] 1) Add 28.8 parts of methallyl alcohol into the reaction kettle, add 2.4 parts of catalyst metal sodium within 30 minutes, control the reaction temperature at 20-30°C, and the reaction time is 0.5-1.0 hours; after the reaction, put the product into In 259.2 parts of methallyl alcohol, replace with nitrogen, raise the temperature to 70°C, feed 638.4 parts of ethylene oxide and 273.6 parts of propylene oxide, control the reaction temperature at 70-95°C, and the reaction time is 3.0-4.0 hours; the reaction is over After cooling down to 70°C, a methallyl oligomer with a molecular weight of 300 was obtained.
[0031] 2) Add 540 parts of the methallyl oligomer with a molecular weight of 300 obtained in step 1) to the reactor, add 0.3 parts of catalyst 18-crown-6 and 1.5 parts of hexachlorocyclotri Phosphazene, control the reaction temperature at 30-50°C, and the reaction time is 0.5-1.0 hours; after the reaction is completed, replace with nitrogen, raise the temperature to 80...
Embodiment 2
[0034] 1) Add 25.2 parts of methallyl alcohol to the reaction kettle, add 3.7 parts of catalyst metal potassium within 30 minutes, control the reaction temperature at 25-30°C, and the reaction time is 0.5-1.0 hours; after the reaction, put the product into In 226.8 parts of methallyl alcohol, replace with nitrogen, raise the temperature to 70°C, feed 681.1 parts of ethylene oxide and 291.9 parts of propylene oxide, control the reaction temperature at 70-95°C, and the reaction time is 3.0-4.0 hours; the reaction is over After cooling down to 70°C, a methallyl oligomer with a molecular weight of 350 was obtained.
[0035] 2) Add 315 parts of the methallyl oligomer with a molecular weight of 350 obtained in step 1) to the reactor, add 0.35 parts of catalyst 18-crown-6 and 2.1 parts of hexachlorocyclotriacetate within 30 minutes For phosphazene, control the reaction temperature at 30-50°C, and the reaction time is 0.5-1.0 hours; after the reaction is completed, replace with nitrog...
Embodiment 3
[0038] 1) Add 21.6 parts of methallyl alcohol into the reaction kettle, add 1.8 parts of catalyst metal sodium and 2.4 parts of metal potassium within 30 minutes, control the reaction temperature at 30-40 ° C, and the reaction time is 0.5-1.0 hours; after the reaction Put the product into 194.4 parts of methallyl alcohol, replace it with nitrogen, raise the temperature to 80°C, feed 787.2 parts of ethylene oxide and 196.8 parts of propylene oxide, control the reaction temperature at 80-95°C, and the reaction time is 3.0- 4.0 hours; after the completion of the reaction, the temperature was lowered to 70° C. and discharged to obtain a methallyl oligomer with a molecular weight of 400.
[0039] 2) Add 300 parts of the methallyl oligomer with a molecular weight of 400 obtained in step 1) to the reactor, add 0.4 parts of catalyst 15-crown-5 and 2.3 parts of hexachlorocyclotriacetate within 30 minutes For phosphazene, control the reaction temperature at 35-55°C, and the reaction time ...
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