Preparing method of monocyclic aromatic hydrocarbon efficient water reducing agent

Abstract

The invention discloses a preparing method of a monocyclic aromatic hydrocarbon efficient water reducing agent. In the monocyclic aromatic hydrocarbon efficient water reducing agent, anhydrous sodium sulfite, sodium sulfamate, acetophenone, bisphenol A, and formaldehyde monomer are adopted as main raw materials. The preparing method comprises the steps of firstly using sodium hydroxide generated by hydrolysis of part of anhydrous sodium sulphite as a catalyst, under an alkaline condition, making a condensation reaction happen between acetophenone and part of formaldehyde, making acetophenone react with a compound sulfonating agent (sodium sulfamate and a hydrolysis product of anhydrous sodium sulphite), and introducing amino groups and sulfonic acid groups onto benzene rings to form a sulphonate formaldehyde-acetophenone condensation product intermediate; then under an alkaline condition, making a methylation reaction happen between bisphenol A and the other part of formaldehyde so that bisphenol A and the other part of formaldehyde can be condensed into a bisphenol A-formaldehyde intermediate, and meanwhile adding the rest hydrolysis product of anhydrous sodium sulphite and formaldehyde to the bisphenol A-formaldehyde intermediate to introduce sulfonate; finally, making a condensation polymerization reaction happen between a sulphonate formaldehyde-acetophenone condensed intermediate and a sulphonate bisphenol A-formaldehyde intermediate so that the monocyclic aromatic hydrocarbon efficient water reducing agent can be synthesized. The molecular chains of the monocyclic aromatic hydrocarbon efficient water reducing agent have -SO3H, -OH, and -NH2 groups, under a low doping dosage, the monocyclic aromatic hydrocarbon efficient water reducing agent plays a good dispersion effect on cement particles, and meanwhile green concrete which is doped with the monocyclic aromatic hydrocarbon efficient water reducing agent has a low bleeding rate.

Description

technical field [0001] The invention relates to a preparation method of a high-efficiency water reducer, in particular to a preparation method of a monocyclic aromatic hydrocarbon type high-efficiency water reducer, which belongs to the field of concrete materials. Background technique [0002] High-efficiency water reducer is an indispensable component for the preparation of civil engineering materials, and has been widely used in the construction of civil engineering such as buildings, bridges, tunnels, and drilling platforms. Under the condition of keeping the working performance of concrete unchanged, adding a small amount of high-efficiency water reducing agent can reduce the water consumption of concrete materials by more than 30%, and the fresh concrete mixed with high-efficiency water reducing agent is easy to scratch and vibrate. The use of high-efficiency water reducers also reduces the amount of water in concrete materials and increases the compactness of hardened...

AI Technical Summary

Problems solved by technology

ASPF single-ring aromatic hydrocarbon type high-efficiency water-reducing agent has high water-reducing effect, but it is sensitive to the dosage and easy to bleed, which restricts its large-scale use in engineering

The price of AH single-ring aromatic hydrocarbon type high-efficiency water reducer is high, and its application range is also subject to certain restrictions.

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