Preparation method of polycarboxylate superplasticizer macromonomer
A technology of water reducer and macromonomer, which is applied in the field of preparation of polycarboxylate water reducer macromonomer, can solve the problems of low flash point, easy combustion, long reaction time between catalyst and initiator, etc., and achieve saving Effects of saving energy, saving production time, and reducing production costs
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Embodiment 1
[0025] The preparation of embodiment 1 isopentenyl polyoxyethylene ether (2400)
[0026] (1) Preparation of catalyst: Add 1500kg of prenyl alcohol into the reactor and start stirring, open the vacuum system of the reactor, wait until the negative pressure of the reactor is less than 0.08MPa, suck 100kg of sodium methoxide through the negative pressure in the reactor In the reaction kettle, replace the reaction kettle with nitrogen. After filling the reactor with nitrogen to normal pressure, the reaction kettle is heated and stirred continuously. The stirring speed is 150-350r / min. distilled. Distillation is carried out through the rectification tower combined with the reactor, the vacuum system of the reactor is turned on, the pressure inside the reactor is maintained at -0.05~-0.08MPa, the temperature of the reactor is maintained at 80~110°C, the methanol in the gas phase of the reactor Cooled by the condenser behind the rectification tower, the cooler uses chilled water to ...
Embodiment 2
[0032] The preparation of embodiment 2 methallyl polyvinyl ether (2400)
[0033](1) Preparation of the catalyst: 1500kg of 2-methallyl alcohol is added to the reactor and the stirring is started, the vacuum system of the reactor is opened, until the negative pressure of the reactor is less than 0.08MPa, the negative pressure in the reactor will Inhale 100kg of sodium methoxide into the reactor, replace the reactor with nitrogen, fill the reactor with nitrogen to normal pressure, heat the reactor and continue to stir, and react for 10-20min under the condition of stirring speed of 150-350r / min, and then clean the reactor. The resulting methanol is distilled. Distillation is carried out through the rectification tower combined with the reactor, the vacuum system of the reactor is turned on, the pressure inside the reactor is maintained at -0.05~-0.08MPa, the temperature of the reactor is maintained at 80~110°C, the methanol in the gas phase of the reactor Cooled by the condense...
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