Concrete superplasticizer in amino carboxyl classes, and synthetic method

Abstract

This invention discloses a high-efficiency amino-carboxylic water reducer for concrete. The water reducer has such advantages as low cost, high water-reducing rate, and good adaptability to cement. This invention also discloses the method for synthesizing the water reducer, and its application. The method comprises: performing sulfonation reaction on concentrated H2SO4, benzoic acid and phenol, neutralizing with NaOH to obtain sulfonation product, and performing condensation polymerization for 6 plus and minus 0.5 h. When the addition amount is 0.35-0.6 wt. % of cement, the water reducer can exhibit a water-reducing rate of 20-35%.

Description

technical field [0001] The invention relates to a concrete high-efficiency water reducer, in particular to an ammonia-based concrete high-efficiency water-reducer, and also relates to a synthesis method of the ammonia-carboxylate concrete high-efficiency water reducer. technical background [0002] As an important component of high-strength and high-performance concrete, concrete superplasticizer plays an increasingly important role. At present, in the domestic market, high-efficiency water reducers mainly include five categories: naphthalene-based, melamine-based, aliphatic, sulfamate-based, and polycarboxylate-based. Among them, the market share of naphthalene-based high-efficiency water-reducers reaches 80%. Above, melamine series, aliphatic series and polycarboxylic acid series cannot compete with it due to reasons such as price and performance. After years of research and development and market practice, the sulfamate high-efficiency water reducer has been accepted by ...

AI Technical Summary

Problems solved by technology

[0008] Looking at the various sulfamate high-efficiency water reducers currently researched and developed, there are generally two problems in practical applications, which affect the wide application

One is that the price of phenol and sodium p-aminobenzenesulfonate in the raw materials is relatively expensive, which leads to the high price of this type of high-efficiency water reducer; the other is that the application process is sensitive to the dosage. If the dosage is too low, the cement particles cannot be fully dispersed. The slump of concrete is small, if the amount is too large, it is easy to make the cement particles too dispersed, the water retention of concrete is not good, the phenomenon of segregation and bleeding is serious, and even the slurry compaction and water are separated, so it is difficult to control during construction.

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