Concrete superplasticizer in amino carboxyl classes, and synthetic method

A high-efficiency water-reducing agent and concrete technology, which is applied in the synthesis of the ammonia-carboxyl-type concrete high-efficiency water-reducing agent and the field of the ammonia-carboxyl-type concrete high-efficiency water-reducing agent, can solve the problems of insufficient dispersion of cement particles, poor water retention of concrete and concrete problems. Small slump and other problems, to achieve the effect of low cost, good workability and good adaptability to cement

Inactive Publication Date: 2007-07-25
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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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.

Method used

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  • Concrete superplasticizer in amino carboxyl classes, and synthetic method
  • Concrete superplasticizer in amino carboxyl classes, and synthetic method
  • Concrete superplasticizer in amino carboxyl classes, and synthetic method

Examples

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Effect test

Embodiment 1

[0039] Put 30g of benzoic acid, 70g of phenol and 110g of concentrated sulfuric acid into a reaction vessel, raise the temperature to 85°C, carry out sulfonation reaction for 2 hours, neutralize with 30% sodium hydroxide solution to pH 7-8, and obtain the sulfonation reaction product . Add 65g of sulfonation reaction product, 50g of sodium p-aminobenzenesulfonate, 30g of phenol and 240g of water into another reaction kettle, raise the temperature to 80°C, adjust the pH value to 8-9 with sodium hydroxide, stir for 15min, and add dropwise at a uniform speed 75g of formaldehyde, dropwise addition of formaldehyde in about 2 hours, and condensation reaction at a constant temperature of 80°C for 6 hours to obtain the ammonia carboxyl type new high-efficiency concrete water reducer of the present invention.

Embodiment 2

[0041] Put 40g of benzoic acid, 60g of phenol and 110g of concentrated sulfuric acid into a reaction vessel, raise the temperature to 85°C, carry out sulfonation reaction for 2 hours, neutralize with 30% sodium hydroxide solution to pH 7-8, and obtain the sulfonation reaction product . Add 70g of sulfonation reaction product, 42g of sodium p-aminobenzenesulfonate, 30g of phenol and 240g of water into another reaction kettle, raise the temperature to 85°C, adjust the pH value to 8-9 with sodium hydroxide, stir for 15min, and add dropwise at a uniform speed 72g of formaldehyde, about 2 hours after the dropwise addition of formaldehyde, and a condensation reaction at a constant temperature of 85°C for 6 hours to obtain the ammonia carboxyl type new high-efficiency concrete water reducer of the present invention.

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/22C02F103/30
Inventor 何廷树徐立斌李红侠
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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