Early-strength functional monomer and preparation method thereof, and early-strength polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention discloses an early-strength functional monomer and a preparation method thereof, and an early-strength polycarboxylate superplasticizer and a preparation method thereof. The early strength functional monomer is prepared by the following steps: (1) adding an aminoazo compound and unsaturated alcohol into a reaction container in proportion, and stirring until the azo compound is completely dissolved; (2) adding a polymerization inhibitor and a catalyst into the reaction container, gradually heating to 100 DEG C, and carrying out reflux reaction for 5-8 hours; and (3) after the reaction is finished, cooling to 40 DEG C, neutralizing with a sodium bicarbonate solution until the liquid is neutral, extracting with water three times, recovering an organic phase, drying with anhydrous sodium sulfate for 12 hours, filtering, and distilling to obtain the ester early strength functional monomer. The early-strength polycarboxylate superplasticizer containing the early-strength functional monomer can remarkably improve the early strength of concrete without influencing the later strength in a normal environment, can reduce the viscosity of the concrete and improve the water retention property of the concrete, and is wide in application range and beneficial to popularization.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and more specifically relates to an early-strength functional monomer, an early-strength polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] With the adjustment of the national housing industrialization policy, the introduction of the concept of green development and the deepening of the sustainable development strategy, the development trend of the industry will gradually shift from ready-mixed concrete to construction industrialization and concrete prefabricated components. Concrete prefabricated components require concrete to have good workability, which can meet the construction needs of prefabricated components, and also need to have early strength performance, which can improve the turnover rate of formwork, speed up construction progress, and improve production efficiency. The means to improve the early strength performance of component...

AI Technical Summary

Problems solved by technology

However, reducing the water-binder ratio will increase the viscosity of concrete, and increasing the amount of cement will increase the heat release of cement and increase the risk of cracking of components. , it is easy to introduce chloride ions, which will cause corrosion of steel bars and cause salt precipitation and frost on the concrete surface. In addition, some inorganic salts have poor compatibility with polycarboxylate superplasticizers. Use ordinary polycarboxylate superplasticizers and triethanolamine Compounding, the effect of early strength is also very limited

In addition, due to the low temperature in winter in northern my country, the water in the concrete will freeze, causing the ice swelling force to damage the cement stone structure and affect the later strength development of concrete.

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