Long-acting stable slump-preserving water-reducing agent for medium and low slump concrete and preparation method thereof
A slump and concrete technology, which is applied in the field of preparation of small-molecule water-reducing agents, can solve the problems of high slump sensitivity of water-reducing agents, difficult to achieve, and difficult to apply to medium and low slump concrete.
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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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