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Concrete superplasticizer in amino carboxyl classes, and synthetic method

A high-efficiency water-reducing agent and concrete technology are applied in the field of ammonia carboxylate concrete high-efficiency water-reducing agent. Small slump and other problems, to achieve the effect of low cost, good workability, and no loss of slump

Inactive Publication Date: 2009-11-18
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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

[0041] Put 30g of benzoic acid, 70g of phenol and 110g of concentrated sulfuric acid into the reaction vessel, raise the temperature to 85°C, carry out sulfonation reaction for 2h, and neutralize with 30% sodium hydroxide solution to pH 7-8 to obtain the sulfonation reaction product . Add 65g of sulfonation reaction product, 50g of sodium p-aminobenzene sulfonate, 30g of phenol and 240g of water into another reaction kettle, raise the temperature to 80℃, adjust the pH to 8-9 with sodium hydroxide, stir for 15min, add dropwise at a constant speed The formaldehyde is 75g, and the dropwise addition of the formaldehyde is completed in about 2 hours, and the condensation reaction is carried out at a constant temperature of 80°C for 6 hours to obtain the new type of ammonia carboxylate concrete superplasticizer of the present invention.

Embodiment 2

[0043]Put 40g of benzoic acid, 60g of phenol and 110g of concentrated sulfuric acid into the reaction vessel, heat to 85°C, carry out sulfonation reaction for 2h, and neutralize with 30% sodium hydroxide solution to pH 7-8 to obtain the sulfonation reaction product . Add 70g of sulfonation reaction product, 42g of sodium p-aminobenzene sulfonate, 30g of phenol and 240g of water into another reaction kettle. The temperature is raised to 85°C, the pH is adjusted to 8-9 with sodium hydroxide, stirred for 15min, and added dropwise at a constant speed. The formaldehyde is 72g, the formaldehyde is added dropwise in about 2 hours, and the condensation reaction is carried out at a constant temperature of 85°C for 6 hours to obtain the new type of ammonia carboxyl concrete superplasticizer of the present invention.

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Abstract

The invention discloses an ammonia carboxyl high-efficiency water reducer for concrete. The ammonia carboxyl high efficiency water reducer for concrete has low cost, high water reducing rate and good adaptability to cement. The invention also discloses the method and application of synthesizing the high-efficiency water reducer of ammonia carboxyl concrete. Firstly, concentrated sulfuric acid, benzoic acid and phenol are used as reaction raw materials to carry out sulfonation reaction, and then neutralized with sodium hydroxide to obtain a sulfonated product. Then the mass ratio of polycondensation reaction is 65-80:25-40; the polycondensation reaction time is 6±0.5h. When the amount of the ammonia carboxyl new concrete high-efficiency water-reducing agent converted into solid is 0.35-0.6% of the cement weight, the water-reducing rate is 20%-35%. The sulfamate high-efficiency water reducer of the invention has low cost, high water reducing rate, good adaptability to cement and easy industrial production.

Description

Technical field [0001] The invention relates to a superplasticizer for concrete, in particular to a superplasticizer for ammonia-carboxyl concrete, and a method for synthesizing the superplasticizer for concrete. technical background [0002] As an important component of high-strength and high-performance concrete, concrete superplasticizer has an increasingly important role. Currently in the domestic market, there are mainly five types of superplasticizers: naphthalene series, melamine series, aliphatic series, sulfamate series and polycarboxylic acid series. Among them, the market share of naphthalene series superplasticizers reaches 80%. Above, melamine series, aliphatic series and polycarboxylic acid series cannot compete with them due to reasons such as price and performance. After research and development and market practice in recent years, the sulfamate superplasticizer has been accepted by users because of its good cement adaptability, high water reduction rate, low slum...

Claims

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Application Information

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Patent Type & Authority Patents(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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