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A kind of sulfamate water reducing agent and preparation method thereof

A technology of sulfamic acid salt and p-aminobenzenesulfonic acid, which is applied in the field of concrete admixtures, can solve the problems of increasing the complexity of manufacturing, and achieve the effects of improving adaptability, easy to control the dosage, and not easy to segregate and bleed

Active Publication Date: 2020-08-11
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the existing technology has made some progress in reducing the dosage sensitivity of sulfamate superplasticizers and improving water retention and adaptability, these technologies have to introduce other comonomers, which increases the complexity of manufacturing

Method used

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  • A kind of sulfamate water reducing agent and preparation method thereof
  • A kind of sulfamate water reducing agent and preparation method thereof
  • A kind of sulfamate water reducing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A kind of sulfamate water reducer, its preparation steps are as follows:

[0068] (1) Add 236kg of sodium p-aminobenzenesulfonate dihydrate (98%) and 190kg of phenol (98%) into 500kg of water in sequence, and heat the mixing system to 75°C, stir, dissolve and mix;

[0069] (2) adding sodium hydroxide solution (30%) to adjust the pH value to 9.5;

[0070] (3) Slowly add 284kg of formaldehyde solution (37%) so that the temperature of the reaction solution does not exceed 95°C, and then keep the temperature at 94 to 96°C for 5 hours;

[0071] (4) Cool down to 60-70° C., add 22 kg of hydrogen peroxide (30%), keep warm within this temperature range for 1 hour, and cool to obtain a liquid product.

Embodiment 2

[0073] A kind of sulfamate water reducer, its preparation steps are as follows:

[0074] (1) Add 236kg of sodium p-aminobenzenesulfonate dihydrate (98%) and 152kg of phenol (98%) into 600kg of water in sequence, and heat up the mixing system to 75°C, stir, dissolve and mix;

[0075] (2) adding sodium hydroxide solution (30%) to adjust the pH value to 9.4;

[0076] (3) Slowly add 243kg of formaldehyde solution (37%) so that the temperature of the reaction solution does not exceed 95°C, and then keep the temperature at 92 to 94°C for 5.5 hours;

[0077] (4) Cool down to 60-70° C., add 11 kg of hydrogen peroxide (30%), keep warm within this temperature range for 1 hour, and cool to obtain a liquid product.

Embodiment 3

[0079] A kind of sulfamate water reducer, its preparation steps are as follows:

[0080] (1) Add 236kg of sodium p-aminobenzenesulfonate dihydrate (98%) and 171kg of phenol (98%) into 600kg of water in turn, and heat up the mixing system to 75°C, stir, dissolve and mix;

[0081] (2) adding sodium hydroxide solution (30%) to adjust the pH value to 9.7;

[0082] (3) Slowly add 308kg of formaldehyde solution (37%) so that the temperature of the reaction solution does not exceed 95°C, and then keep the temperature at 95 to 97°C for 4.5 hours;

[0083] (4) Cool down to 60-70° C., add 42 kg of potassium permanganate (99.5%), keep warm within this temperature range for 1 hour, and cool to obtain a liquid product.

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Abstract

The invention discloses a sulfamate water reducing agent and a preparation method thereof. The sulfamate water reducing agent, on the basis of an existing sulfamate water reducing agent, also containsa p-benzoquinone structural unit. The sulfamate water reducing agent prepared by the method provided by the invention is improved, to some extent, in water reduction performance under a low doping amount and is basically unchanged in water reduction performance under a high doping amount, and is obviously decreased in doping-amount sensitivity; a doping amount is easily controlled in application;segregation and bleeding statuses difficultly occur and the adaptability is promoted.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a sulfamate water reducer and a method for preparing the water reducer. Background technique [0002] Concrete is currently the most used building material in the world and has been widely used in various projects. Modern concrete is usually mixed with sand, stone, cement, mineral admixtures (fly ash, mineral powder, etc.) and admixtures, mixed with water, and hardened. Among them, water reducing agent is the most widely used concrete admixture. The function of the water reducer is to significantly reduce the amount of water added when mixing concrete, and at the same time improve the fluidity of the concrete when it is freshly mixed and the strength after hardening, thereby improving the quality of the project. [0003] Currently widely used water reducing agents are classified according to their chemical composition: lignosulfonate water reducing agent, naphthalene water re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G16/04C04B24/22C04B103/30
Inventor 乔敏吕志锋吴井志陈健高南箫单广程冉千平
Owner JIANGSU SOBUTE NEW MATERIALS
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