Viscosity reduction type concrete super plasticizer as well as preparation method and application thereof
A superplasticizer and concrete technology, applied in the field of concrete admixture, can solve the problems of insufficient water reducing rate, poor workability, high viscosity, etc., and achieve the effect of increasing hydrophobicity, increasing the thickness of water film layer, and reducing viscosity
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[0051] Preparation of polyether monomer d:
[0052] Put the head monomer e in a 2L dry stainless steel high-pressure reactor, add an appropriate amount of catalyst and polymerization inhibitor, stir to dissolve, seal the reactor, replace the air in the reactor with nitrogen three times, and then vacuumize the reactor to -0.09MPa Next, turn on the heating and raise the temperature to 120°C, while keeping the reactor continuously vacuumed for 30 minutes and then stop, then continue to slowly feed an appropriate amount of ethylene oxide into the kettle to maintain the pressure in the kettle at 0.15-0.2MPa, and the reaction temperature at 110-150°C , when the addition of ethylene oxide is completed, continue the constant temperature reaction until the pressure no longer drops, and after maintaining for 30 minutes, evacuate to below -0.008MPa, cool down to 60°C, neutralize with glacial acetic acid to about pH=7, and discharge to obtain The required polyether monomer d (see Table 1 ...
preparation Embodiment 1
[0071]In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 300 g of deionized water to make a base, purging the reaction vessel with nitrogen while stirring, and raising the temperature to 40 ° C, 234.5 g (0.035 mol ) c-1, 14.42g (0.07mol) a-1 and 25.2g (0.35mol) b-1 and 200g are made into drop solution I, 5.48g thioglycolic acid, 2.74g L-ascorbic acid and 170g water are made into Add solution II dropwise, add 5.50g of hydrogen peroxide into the bottoming water, add solution I dropwise at a constant speed for 2 hours, and add solution II dropwise at a constant speed for 2.5 hours. Polymer solution, the weight average molecular weight of the obtained polymer is 56400.
preparation Embodiment 2
[0073] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 250 g of deionized water to make a base, purging the reaction vessel with nitrogen while stirring, and raising the temperature to 40 ° C, 275 g (0.05 mol) c-2, 4.7g (0.05mol) a-2 and 37.6g (0.4mol) b-2 were made into dripping solution I, and 1.58g thioglycolic acid, 3.77g eagle white powder and 240g water were made into dripping solution II , add 7.86g of hydrogen peroxide into the bottoming water, add solution I dropwise at a constant speed for 3 hours, and add solution II dropwise at a constant speed for 3.5 hours. The weight average molecular weight of the obtained polymer was 24,700.
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