Long-acting stable slump-retaining water reducer for medium and low-slump concrete as well as preparation method thereof
A technology of slump and concrete, which is applied in the field of preparation of small molecule water reducers, can solve the problems of high slump sensitivity of water reducers, difficulty in realization, difficulty in application of medium and low slump concrete, etc., and achieves the synthesis process Simple and efficient, low raw material cost, small initial slump fluctuation
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Synthetic example 1
[0057] Weigh 1000 parts of methoxypolyethylene glycol (Mn=2000, a=43) into the reactor, then add 300 parts of solvent water, and then add 21 parts of NaOH. After stirring evenly, control the temperature of the reaction system between 30°C and 60°C, weigh 138.75 parts of epichlorohydrin and gradually add it to the above reaction system, and then weigh 2 parts of the catalyst tetrabutylammonium bromide into the reaction system. After the addition, the reaction kettle was closed, and the temperature was raised to 80° C., and the reaction was continued for 20 h. After the reaction, under the condition of 60℃~80℃, distill off the volatile components under reduced pressure, including unreacted epichlorohydrin and reaction solvent water, to obtain viscous light brown solid methoxypolyethylene glycol Glycidyl ether C-1.
[0058] Similarly, the following polyether-based glycidyl ethers were prepared for the synthesis of aminated methoxypolyethers.
Synthetic example 2
[0060] Weigh 1000 parts of methoxy polyether (Mn=3000, a=65) into the reactor, then add 400 parts of solvent water, and then add 19.64 parts of KOH. After stirring evenly, control the temperature of the reaction system between 30 ° C and 60 ° C, weigh 107.92 parts of epichlorohydrin and gradually add it to the above reaction system, and then weigh 6 parts of the catalyst phenyltrimethylammonium chloride and add it to the reaction system. After the addition, the reaction kettle was closed, and the temperature was raised to 90° C., and the reaction was continued for 15 hours. After the reaction, under the condition of 60℃~80℃, distill off the volatile components under reduced pressure, including unreacted epichlorohydrin and reaction solvent water, to obtain viscous light brown solid methoxypolyethylene glycol Glycidyl ether C-2.
Synthetic example 3
[0062] Weigh 1000 parts of methoxy polyether (Mn=4000, a=90) into the reactor, then add 500 parts of solvent water, then add Na 2 CO 3 30.47 servings. After stirring evenly, control the temperature of the reaction system between 30°C and 60°C, weigh 115.63 parts of epichlorohydrin and gradually add it to the above reaction system, then weigh 10 parts of the catalyst dodecyltrimethylammonium bromide and add it to the reaction system . After the addition, the reaction kettle was closed, and the temperature was raised to 100° C., and the reaction was continued for 12 hours. After the reaction, under the condition of 60℃~80℃, distill off the volatile components under reduced pressure, including unreacted epichlorohydrin and reaction solvent water, to obtain viscous light brown solid methoxypolyethylene glycol Glycidyl ether C-3.
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